http://zynga.custhelp.com/app/answers/detail/a_id/586
How long is a day in FarmVille?
A day in Farmville is 23 hours long, that's just enough time to tend to your fields and get some rest. While life in the country is a bit slower than city life there is still much to be done on a Farm. You'll want to stay on top of it or you'll lose your crops. Plan when and what you plant wisely.