According to DMV.org, a person with experience is usually able to change a flat tire within 20 minutes or less. Adverse conditions, such as darkness or inclement weather, make the process take longer.
Having easy access to the jack, lug nut wrench and spare tire cuts down on the time that is spent changing the tire. Placing the lug nuts where they cannot roll away saves time, as well. The car is safest if moved out of the road and onto a flat surface with tire blocks placed to secure it. Hazard lights and a safety triangle alert other motorists to keep clear during the tire change. Having a flashlight and rain poncho at hand help speed the process when conditions are difficult.