It took me 105 hours to finish Refrain earlier this year (I got the plat but reaching the good ending means having the plat so it's not a big deal), so I don't know if I really want the sequel to be longer. Is the game as good as the first one?
If I list all the games that took me more than 100h this year:
- Eiyuu Densetsu: Sen no Kiseki III : 130h
-Labyrinth of Refrain: Coven of Dusk: 105h
-Pillars of Eternity II: Deadfire + All DLC: 125h
-Eiyuu Densetsu: Zero no Kiseki : 110h
-Xenoblade Chronicles: Definitive Edition: 115 h
My Ao no Kiseki playthrough was 98h (so almost 100h again), and I'm sure that when I finish Sen IV next year (finished act 1 and waiting for the localization patch) it'll be more than 110h too. And yeah I'll play P5R some time next year too.
So far I'm liking it more than Refrain, even, so I'd definitely say it's worth playing. I'll see how I feel by the end.