See. There's a difference between what I'm suggesting and timed events.
Example of timed event: You arrive at the grove and learn there is a ritual that will be completed in 3 days. If you don't complete the ritual in 3 days, the tieflings are kicked out and the grove is sealed off. Mission failed. GG. Guess we'll get 'em next time.
Example of what I'm suggesting: You arrive at the grove and learn there is a ritual. No one says how long it'll take. You ignore the quest and long rest 3 times. Someone shows up at camp and says the ritual was interrupted by Rath. Phshew! You still have time, but by doing this Larian is letting you know that you might want to focus a bit more on that questline. Still no exact time given, but now there's a bit of a follow up on the initial threat the game already gave you.
See. The game gives you several vaguely timed quests but then doesn't follow through at all. That's part of my issue with it.
