This run had:

~a missed a Study cycle ~2 Observatory falls ~around 20 lost seconds because I was thinking ahead and got distracted ~around 20 seconds lost to that happening again and missing the Attic Mumbo Doll ~around 5 seconds lost because of a new glitchy thing with Atticus, which I'll gladly take ~a Trophy Room death ~some miscellaneous bits of sketchy movement throughout

sub-1 hour for 100% (on Normal) is definitely a doable thing, assuming you don't mess the above things up while getting a decent Game Room and Dining Room.