At least 4 hours. Probably longer if you pre-heat the cooler with hot water.
Brian Sweeney - CBJ #3691 - '77 Step Van Mobile Kitchen, Horizon Marshall, WSM with Pro Q Stacker, Weber Kettle & Smokey Joe GOLD.
"Any sufficiently advanced technology is indistinguishable from magic" - Clarke's Third Law
Last edited by PCDoctor_1979; 12-06-2011 at 12:55 PM..
Reason: Added the part about pre-heating