To be fair even an hour and a half is good going, i spent 3 hours i think on normal owl.
Well, normal owl is pretty tough, still took me more than 10 tries easily and didn't feel easy at all. I'm certain I wouldn't be able to do him first try if I had to fight him again. Daddy owl is insane, though.
All the other bosses felt reasonably challenging and fair, Butterfly as first boss 3-4 tries, Gyoubu first try, Geni more or less same as Ashina owl as I wanted to learn him, Guardian Ape first try,
double ape
This mofo, though, ridiculous. He's harder than Orphan of Kos
I really should start using prosthetics and sugars to have an easier time as I'm close to the end. Maybe on NG+, I have quite a few sugars, snap seeds and the lot And loads of emblems
I second the above opinion, Geni is a brilliant boss.