As the name suggests, the Le Mans race is a full day of almost continuous driving. To ensure that Le Mans drivers can find time to sleep, each team comprises three drivers who rotate in shifts so that they can rest when not driving. Each driver might be at the wheel from anywhere between 45 minutes to four hours before swapping when the cars stop for fuel and tire changes. The three-driver rule was introduced in the 1980s; prior to this most teams featured only two drivers, or occasionally only one!