I was filling in for a friend during a competition. This time I got a select 12# brisket (aged 14 days ) I cooked it between250-275 for 16 hours and the flat was still at 160 degrees on 2 thermometers.. I didn't realize the "stall"could last that long? I am pissed and puzzled? Any ideas on what was going on? -2ndHandSmoke830