I mean literal, what was the span of each games story?

They didn't change clothing, but I think that's because either the technical problems or laziness, or the Fantasy crap lol

Well, the only ones I can really say are FF8 and X cause, it seems it kinda tells us the end of each day.

Sorry for listing, but this way I can show you my understanding of each day.

FF8
After squall got his scare(one day)
After the SeeD Dance(2 days)
After the sorceress assination attempt(day three, tho it seems a little quick)

End disc one, 3 days in my understanding.

After the garden almost blew(day 3)
After Fishermans concert(Day 4)
After returning to the Garden after Trabia part(Day 5)
After Garden War(Day 6)

End disc 2...

I am literally playing through FF8 again right now to refresh my memory, so I will post more when I finish, but I think in all it is about a week and a half.

phew... Now FFX

From looking from Beginning Zanarkand, to end game...
I think it is about 2 weeks...
And I'm kinda tired as it is 3:18am right now so I'll get back to this O.>