...huh, really? Could be my rust after not playing FNAF 1 so long so maybe I felt like they were longer. Good to know tho!
FNAF 1 had the longest nights in the series (8:55 per night, was supposed to be 9:00 but a bug shortened every hour after the first hour by 1 second) as opposed to FNAF 2-4 which were all closer to 6 minutes (6:42, 5:48, and 6:00, respectively)
Ahhh, interesting! I've actually never played FNAF 2-4 or Sister Location, so really the only comparison I have is the OG and the lewd fangames, heh.