I was including the second bit down to where you fight the first proper boss, as that's mainly for stealth practice, shooting, revenants, summons and various other basics that the tight tutorial doesn't really bother with, I'd say it took me 30ish mins to get through and I thought it was a pretty good onboarding sequence.
Nioh has a shit-ton of mechanics! I can imagine people getting overwhelmed before they even get to the point of starting to put everything together such that they can create a style that they find fun to play as.
I love FROM's approach, but to be honest I don't think its mechanically the gold standard. Particularly given how incremental the advancements have been since Demon's basically defined the format way back in 2009. Nioh is just on a different level when it comes to complexity and customizabilty, and this game seems like it takes it even higher.
As for the people harping on about the graphics: Whatever you say about Katana Engine, and Nioh's visual design, it cannot be argued that at least it looks like itself. Which is way more than can be said for this endless parade of UE5 titles coming out of China of late... Yes they look technically "modern" but thanks to the extensive use of the same lighting models, photogrammetry, and virtualized geometry they are largely visually interchangable.