In the hospitality industry, hotels primarily bill based on the number of nights spent in a room rather than a 24-hour day cycle. A "night" is defined by the period between the hotel's official check-in time (typically 3:00 PM or 4:00 PM) and the check-out time the following morning (usually 11:00 AM or 12:00 PM). If you book a stay from Friday to Sunday, you are charged for two nights: Friday night and Saturday night. Even if you arrive at 8:00 AM on Friday, you are technically occupying the "night" of Friday. This system allows the hotel housekeeping staff a "turnover window" of 3 to 5 hours to clean and sanitize the room for the next guest. Because you are paying for the nightly occupancy, a "3-day trip" often only includes two nights of accommodation. This distinction is vital for 2026 travelers to understand when budgeting for parking fees or pet surcharges, which are also typically applied on a per-night basis.