Yes... im a bit worried because in early access it looks like that this short story in first act has taken a lot of time and money to make.. which might mean that we are about to get short game and low max level.
While at the same time with little bit efford and cost effective ways you can make this game very long and very very replayable. Small tweaks can double the playhours without being expensive to develop. There is potential for that.
I wouldn't be worried about either of these in the slightest.
The game is said to be at least 100 hours or at least as long as D:OS2 to my memory. This in my estimation is an understatement. One person I've seen post here claimed to have done a very thorough playthrough and clocked like 50 hours. EA is less than the first act of what I'm guessing will be a three act game. Of course it won't be long if you speedrun. Max level was said in one interview (to my knowledge the most recent source on the matter) to be more than 10. For me personally this is more than enough - levels in D&D 5e are very impactful. Getting into tier 4 (or even far into tier 3) might be problematic.
As for replayability... I think there'll be more than enough. Maybe more than there should be. They have a lot of things to improve that ties to replayability (some story/dialogue stuff, like the evil path from what I hear, as well as class identity). You'll be able to play as 8 origins or many custom character combos, choose different ways of dealing with things in game etc. Some things will be hidden unless a certain combination of factors is in place. It was once stated that there are 16 endings (more precisely that you'll need to play the game 16 times to see everything) + origin endings (iirc).
