come to think of it, enigma's probably right, I think it was 3 days.
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Zanarkand-> Besaid 1 day
Besaid->Kilika 1 day
Kilika->boat to luca 1 day
Boat to Luca ->Mi'ihen high road 1 day
There's another night somewhere after Operation Mi'ihen, so at least one day, probably more than that.
Then we don't see another nighttime/twilight scene until The Spring (that I can remember) so that's another at least one day, probably two or three..
From there to Zanarkand is the same case, so another one and or two days.
Minimum of one week, based off of in-game sunsets and twilights.
No no no. a relationship (between tidus and yuna in particular) takes MONTHS to develop and climax in real life. either that or tidus is a major pimp.