No Ragnarock. Not 5 minutes on the nautiloid. Im referring to I Ended Day, ran through Blighted Village, Shadowheart said, "Im tired. Let's call it a day." I Ended Day. Astarion had some sort of dialogue triggered.
You keeped talking about how you didnt needed to long rest on beach until you at least explored crypt ... now you sudently changing it to completely different situation? O_o
You really should decide what are you talking about, otherwise any discusion is litteraly impossible.
At least with 2 Long Rests per day it is adventure 1 hour, rest 8, adventure 1 hour and rest 8. That's 18 hours. Add 2 short rests per Long. Each short rest is 1 hour. That's roughly 4 more,hours for a total of 22 hours per day. This gives you roughly 2 extra hours per day that could be simply accounted for by saying some rests were longer than others, or you could maybe adventure more than an hour before each Long Rest. Either way, more believable.
I wonder if you realize what did you just say ...
In this scenario you spend 20 hours resting ... and 4 hours per day traveling. O_o
Is this your idea of "smart and good roleplay" where you act like people who just desperately search for cure for their condition? O_o
Even if you were not sleeping, but you were sitting on your ass and for 8 hours watching the clouds ... how is that behaviour "more believable" ?
So why would I want to Long Rest unless it was absolutely necessary?
And this is exacthy why i dont understand you. :-/
In one sentence you justify 20 hours per day spend by resting ... since its "more believable".
In other sentence you demonize ending the day by long rest, since your character cannot afford to "waste time".
Please decide.
1. I have a tadpole in my head that is a foreign object that is a creepy, nasty, ugly, scary thing. At the beginning, especially, I am told multiple times, and may even watch it happen to someone if I trigger the scene, that this tadpole is going to turn me grotesquely into a Mind Flayer in a very, very painful way. Even later, when I am told it is dormant, there is still the looming threat that any day now I might see symptoms. And then, to top it all off, I am told that this thing is special and that the Mind Flayers and the Absolute have special plans for me and my companions. AND THEN, to top it all off, Raphael shows up wanting to likely get his hands on the dumb thing. He tells me to go ahead and shop around, but eventually your time will come when you will come running to him begging for him to save you.
Well, it all depends on your characters attitude ...
First of all, that turning you can watch on Nautiloid, is started by some unknown Illithid technology, that is nowhere around you ... so you are not in imminent danger from it.
Shadowhearth specificly tells you you should have days (plural) at least ...
Laezel even list you all symptoms, and first signs that metamorphosis started ...
And litteraly everyone tells you that they are feeling fine right now.
So yes, you are constantly warned ... but also, all those warnings are "just in case".

And about that attitude ...
Take Wyll for example, he specificly tells you that unless he starts to feel anyhow worse, he refuses to give that tadpole more attention.
2. After reaching the Druid's Grove, I learn that goblins now know where the Grove is.
Do you? O_o
When i reached the Druids Grove, i learned that all goblins who know where the Grove either lies in a pool of his own blood before gate ... or rot in the cage in Tieflings prison.
So how exactly do they know?
3. The druids are performing a ritual to seal off the grove. It is going to be completed in a few days.
Once again, where exactly did you get that?
As long as i know, Kagha is the only one who gives you at least a little specific time ... and she says "soon". O_o
But i get that there is some pressure in this point ...
If that happens, I can't ever buy or sell things in the Grove AND if I care, all the tieflings are going to die either by gnolls on the road or gobbos wiping them out.
Funny thing ... you are talking about things you are told when you reach the Grove ...
But everyone specificly tells you that Grove will be sealed, and that is final.
So you should know you will not be able to buy or sell things it Grove soon ... no matter if you help Tieflings or not.

So Tieflings are really the only concern here.

4. I have companions urging me to complete certain tasks in a timely fashion. Every time I talk to Lae'zel she's nagging at me to stop dawdling and get my butt moving to the creche because it's our only hope for a cure. Shadowheart tells me numerous times that we need to find a healer and it should be our top priority. Gale does too. Astarion as well. "We need to learn to control these things," he urges us. Wyll wants us to get our butts moving to kill the gobbos before it's too late, so that we can save the tieflings he cares about so much.
Shadowheart is just keep reminding you litteraly every option you have, even if that option is allready dead, and even if she refused it at first ... like Gut, or Gith creche, for examples.
I dont remember Gale talking about need to get rid of tadpole even once except that recruiting conversations and "go to hell" one ...
And Astarion mentiones it only when asked. That is hardly conciderable as "urging".

I admit that Lae'zel is actualy urging you ...
But she also mention every time you ask her that symptoms should have started allready, wich once again can give you a little peace to ballance her urges.
Well, and Wyll dont seem to care at all.
All this said, I escape the nautiloid, land on a beach at the beginning of Day 1. I meet Shadowheart and kill devourers. 5 minutes, maybe 10, of actual adventuring. I'm told to Long Rest.
Why exactly you start to count your adventure from the middle? O_o
I dont expect you to rest right there on the beach, since you are so much against that "unnecesary resting" ... so, why exactly all that your character did since he ended on that beach is not counting?
However, I shouldn't HAVE to Long Rest there if I don't need to. If I have full health and spell slots or whatever
Once again im amazed with your roleplay immersion. :-/
Every time I play, if I don't End Day at that point or some time prior to fighting Marli and Barton in the ruins, I miss out on Gale's Mirror Image dialogue.
Yeah, we noticed ... you mention it in every single post, sometimes twice.
I'm going to adventure 20 minutes and rest 23 hours?
This is simply wrong ...
I presumed you would realize that if Druid's Grove actualy would be 15 minutes of walk (even if kinda fast walk) away from Goblins camp, they would probably not still searching it.

So simmilar to that, you understandably and i would dare to say obviously cant take amount of real time gaming as "how long you spend amventuring". O_o
Shadowheart even tells you, if you rest at that point, that she's not sure it's a good idea.
She tells you this every single time, its unavoidable ...
Sometimes it seems like shadowheart at this points is disagreeing with you simply bcs you exists.
How much sleep and rest do my characters need?
I certainly hope for "less than 20 hours per day".

That's what I mean by the game punishing good roleplaying.
Except its not good roleplaying ...
And except game is not punishing you ... you are punishing you and blame the game, that is desperately begging you to use this feature you ignoring. :-/
Or you could trigger multiple dialogues all in one night. I get to the Grove and meet Nettie without resting. I rest. Gale's Mirror Image dialogue is triggered. I talk to Shadowheart and get her "I'm not sure this is a good idea" speech. I talk to Astarion and get his beginning dialogues. I notice Gale has another exclamation mark over his head. I talk to him again and trigger the Go to Hell dialogue. I conclude by going to sleep and trigger Raphael's. Sure, it's a lot of dialogue all at once, but I did it to myself by not resting before then. At least I get to experience all the dialogue and character development.
This is finaly good sugestion ...
Or you can simply move some of them to another night.
Gales philosophy about the hells, have litteraly zero impact on any story, so i dont quite see any problem with this conversation happening one night later. O_o
2. Actually follow through with the story. If you tell me that within days goblins might attack, then make the goblins attack within days. Set a time limit. If they are going to attack within say 7 days from the time you enter the Grove, then after 7 Long Rests the goblins attack the Druid Camp. Same with the Druids and their ritual and Lae'zel being in your party and Wyll, etc. If you don't do things in a reasonable, timely fashion, it makes sense from a story perspective for things to happen because you weren't doing what you were told you should be doing. I'm not suggesting an unreasonable or difficult to meet time frame. Give the players time to still explore the whole map and have fun with it. I'm just saying it would put a limit on the number of times people use Long Rest so that they don't use it so much that it makes all the items you created practically worthless. Plus, it adds more possible endings to different scenarios and more flavor and choices to your gameplay. It adds more strategy too.
I would actualy like this ...
But many people dont. :-/
3. Add better rewards for those who do finish quests in a timely fashion, meaning with only using a certain number of Long Rests.
No, no, no and thousand times no!
This makes all you just said poor excuse to get another advantage.
Again, if I beat the hag without Long Resting, something I've never been able to do myself without complete and total luck, shoving her into a bottomless pit
I should get better gear and gold than someone who fights the Red Caps, Long Rests, fights the Adventurers, Long Rests, and then fights the hag.
How exactly would you justify that? O_o
Hag was hiding some superspecial armor or huge amount of gold into that mud that is around her, and you just get there sooner than she was finished?

Why is she even waiting around for you to come get her at that point?
Why not ... she is in her lair ...
From roleplay perspective you have litteraly no idea what was she doing before you get there.
Again, I think it would make more sense to do what one other player suggested and have Mayrina shipped off to another hag in Baldur's by that point. You can still fight the hag, but it's too late to save Mayrina if you don't rescue her quick enough.
Why would she?
She is in her lair, her own domain full of traps and minions ... she also quite clearly believe that you stand no chance against her ... and unless you tell on her, Marina is at her side.
Also
you would miss that conversation, when she offers you power up in exchange for Marina ... i think you dont like to miss conversations.

So why exactly should she "shipp her off"?
And more importantly ... how?

My point is to reward BETTER roleplaying.
Nope, your point is to reward YOUR roleplaying.