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Don't think I'd try it. 10 hours is probably not enough time. How many briskets and how big are they? I generally shy away from brisket for a catering event just due to the unknown time factor.
Or do it ahead of time and reheat it at the event. You are talking about 9 hours or less by the time you get your smoker cranked up and actually start cooking.
That's what was thinking that I would have to do it ahead of time or just tell them I can't. I'm not a big fan of earning up brisket. I prefer leftovers cold