The fastest four-tire pit stop in NASCAR history was four seconds. According to HistoryOrb.com, this record was set on May 30, 1976 by Bobby Unser.
An average NASCAR pit stop takes about 13 seconds because it usually requires several actions, such as adding fuel and checking for other issues. According to ESPN, a pit crew typically includes a rear tire carrier, a jackman, a rear tire changer, a front tire carrier, a front tire changer, a catch can man, a gas man, a support crew and an extra man. A NASCAR official is also present to watch for rule violations and to maintain pit safety.