OK, let's give this a try. min=beat the game fairly quickly, max=100% completion/being slow/grinding
MGS (PSX)= min 8 hrs, max 16 hrs
MGS2:Sons of Liberty= min 9 hrs, max 17h 30m
MGS3:Snake Eater= min 10h 30m, max 19 hrs
MGS4:Guns of the Patriots= min 12h 30m, max 22 hrs
Crash 3:Warped= min 8 hrs, max 15 hrs
FF I(PSP)= min 17h 30m, max 27 hrs
FF IV(DS)= min 20 hrs, max 35 hrs
FF VI= min 22 hrs, max 37 hrs
FF VII= min 30 hrs, max 85 hrs (takes a while to beat Emerald weapon, get a gold chocobo, and master all materia/summons, especially KOTR)
FF VIII= min 28 hrs, max 64 hrs
FF IX= min 25 hrs, max 60 hrs
FF X= min 32 hrs, max 100 hrs (Anyone who has beat all the side quests in this game knows what I am talking about)
FF XII= min 35 hrs, max 90 hrs
FF XIII= min 38 hrs, max 60hrs
Uncharted:Drake's Fortune= min 6h 30m, max 10h
Uncharted 2:Among Thieves= min 8h, max 12h 30m
Super Mario Bros. (NES emulator on PC)= min 7m, max 3h 30m
Super Mario Bros. 3 (GBA)= min 2h 30m, max 7h 30m
Super Mario World= min 3h 30m, max 9h 30m
Super Mario 64 (N64)= min 13h 30m, max 40 hrs
Super Mario Sunshine= min 16 hrs, max 44 hrs
Super Mario Glaxy= min 15hrs, max 35hrs
Super Mario Galaxy 2= min 14hrs, max 35hrs