The full day rate is for a 24 hour period. i.e. if you pick it up at 9:30am it's due back by 9:30 the next morning. (some conditions apply)
Alternatively, we have a special weekend offer: for the full day rate you can pick it up after 3:30pm Friday and bring it back by 8:00am the following Monday. However, if someone has it rented for the day Friday you won't be able to pick it up until Saturday morning.