What is Considered a One-day Car Rental?

Car rental costs are based on a 24-hour block of time. When you book a one-day car rental, with a pick-up time of 10:00 AM for example, you'll be required to return the rental car by 10:00 AM the next day, or you'll be charged for an additional day. Don't count on grace period for returning your car rental, as there may be another customer that is being kept waiting because you are for all intents and purposes late, if you're not returning the vehicle at the time listed on the car rental contract.