Juat wrapped up my first smoke via the snake method in my 22.5 kettle. I am pleased with the results however I was expecting a longer burn time. Most posts I have read seem to have achieved 10 hours or so on a full ring of coals without ends touching of course . I’ll attach a picture of what I started with. By the end of 8hrs I had consumed the ring I started with plus another half ring. I stacked these 2-1 to start. The second half I added were stacked 2-2. Outside temps were 40 degrees and temps got up to 50 by the end of my cook. I was using kingsford blue. Vents wide open to start and bottom vent adjusted to keep temps between 250-300. Any and all suggestions on thing I could’ve done differently to extend burn time is greatly appreciated.