However, after it runs out, he is unable to use Haki for 10 minutes and using it a second time after causes him to become unconscious, such as in his fights against Doflamingo and Katakuri. But due to his newly awakening powers, the side-effects is no longer the case anymore as Luffy...
Gear 4 can only be used for a limited period of time, after which it runs out, leaving Luffy unable to use Haki for ten minutes. By the end of the Wano Arc, Luffy could freely deactivate Gear 4 before it reached the time limit. Techniques: Gum-Gum Culverin Gum-Gum Rhino Schneider G...