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It was not his second time using it. He used it before on the island Rayleigh trained him on, and stated he needed it to fight the beasts, so we knew he used it many times during the 2 year timeskip. That one fight with Cracker wouldn't logically push his skill with it so far that he'd receive some massive boost in using it.I'm not saying he can go for 11 hours straight now but it could and probably has been extended through the cracker fight. It was his second time using it and the more you use something the more you're accustomed to it plus I'm figuring that the steady extended use would help Luffy adjust to it quicker than random uses spread over long gaps of time. It's not a guarantee his limit expanded but I'm thinking it did.