I'm about 50 hours into Hollow Knight: Silksong now, and I can safely say it's a perfect 10/10 for me—an absolute masterpiece. Even more impressive is that almost the entire game was made by just three people (with Australian developer representatives!), and it's at least twice the size of the original Hollow Knight. I'm two-thirds through Silksong, so I'm thinking it'll take me 80-100 hours by the time I finish it, and I'll probably replay both Hollow Knight and Silksong after that.