One day = 23 hours.
One farmville day is 23 hours long (according to Zangya FAQ pages), 1 hour shorter than on planet earth...
One day.
You dont.
You can't force it to change the date on Farmville.
It gives you 5 farmville cash each day
Well, if you plant a crop that takes one day to be ready for harvest, one day after it is ready, it will wither.
It is an egg that makes you level up and gives you three farmville cash a day.
It takes four days for a rabbit in FarmVille to be fully grown.
Once a day. (Each.)
Grapes take 1 day to harvest in Farmville. 1 day = 24 hours, and 97% of 24 hours = 23.28 hours, or 23 hours 17 minutes. Subtract that time from the full 24 hours, and you have 43 minutes left.
24 hours
Up to 30.