The FAA allows a crew to rest at any point to break their duty time. Putting the crew to rest during the day on a charter in order to accommodate later flight times is called ‘Day Room’.
In instances where a charter requires longer time on the ground than the standard duty day (usually 12hrs) allows, the crew can be put to rest during the day in order to come back on duty later on, past the standard day cut-off. This additional rest period must last 10 consecutive hours.
Day Room charges vary by location, crew and aircraft but range from $600 – $1200, on average.