According to selfbuilt (click link below) 6 minutes with cooling and approximately 3 minutes without. That is a complaint i have with newer high output lights. Yes they can belt out in insane amount of lumens but only for a few minutes before output is reduced. Many times output is below 50% after thermal protection kicks in. So your 5300 lumen light is really only an 1850 lumen light. Also many burst modes are direct driven so each time you use it output is reduced as the cells are depleted.