A full day is counted as 24 hours. Hilton Hotels, whose full name is Hilton International Hotels Group, is a branch of the Hilton Group Company headquartered in the United Kingdom. It has the right to use the "Hilton" trademark worldwide except the United States. The hotel's normal check-in time is after 3 p.m., but if you arrive early and the hotel has a clean room, you can tell the front desk to check in in advance. No matter what time you check in, as long as it is 24 hours, it counts as a day. For example, check-in at 3 p.m. 3 o'clock every day counts as a day.