9.5lb pork butt, not injected or tenderized, just mustard+rub. Went on at 6pm, was at 225 at 7pm. Get kids to bed then check again at 10pm, and cooker lost its heat...down to maybe 125. Re-fired (lump charcoal), back up 250. Check again at 3am, and its down again at 115. Used kingsford this...