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I would say cooking at 225 it will take approximately 4 hours give or take. Cook time will also depend on whether you are going for R, MR, M, or burnt I mean Well Done.
Don't forget to let it rest after cooking so allow at least 1/2 hour for that.
I may cook it a little lower, for longer, and ive been asked to go for medium..but I like the idea of faking out MR by soaking in the Vman soy sauce based marinade for a few days..less pink from the coloring.