I'd say 2 hours would be plenty, it soaks up smoke pretty good. Might even try an hour and a half for the first time. You can always go longer next time if you don't get the level you are looking for. I'm not a fan of overly powerful smoke flavor. What kind of wood are you going to use? That could make a difference as well. If mesquite or hickory I'd go with less time than a milder wood.
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