I have the iQue and run it on my 22.5 WSM, as stated above depending weather conditions, I can get 12 hours out of a 13.9lb bag of Kingsford blue running at 250, started with the minion method. I start with about half a chimney of lit coals directly in the middle of the charcoal ring. open all vents, wait til I see the gauge on the lid at around 175, then close 2 of the bottom vents, keep the lid vent open 100%, hook up the iQue to the adapter and plug it in(turn it on). Wait til the smoker comes up to temp, then add my meat. BTW, that 13.9lb bag doesn't fill the charcoal ring completely, I could put more in and get a longer burn.
Hope that helps.