The play times vary depending on the heating zones you are using (upper body, pockets or gloves) and the heat setting. We tested the jacket heating times while it was on the lowest setting and a single zone so we could figure out the longest play time for the jacket. The play times will decrease when you turn on more zones and adjust the heat level settings higher. In addition to that, charging your phone and heating the jacket at the same time will also decrease battery life faster. Lastly, lower outside temperatures will also affect the length of heating times.