It's all about RNG, really. I've had times when my crypt fight went poorly and had to LR after. Then the harpy fight beat my party up pretty badly and I had to LR there as well.
And I'm not like some. Spider fight LR. Gith fight. LR. Heck, I've LRd before and after the Gith fight just to beat it. Same with the hag and the spider Matriarch.
It does depend on the party comp too and the player experience level with the game. New players will likely be forced to LR 24+ times by the end of EA, maybe even more.
The Underdark especially. Last time I did it, I remember thinking that I was long resting a lot more. Seemed like just about every fight. Especially the dang bulette. Man! That thing is brutal. I think Grym's easier than that thing.
