It is a very simple recipe that I use...4 year seasoned wood that is very dry...dry as in instantly catches...It was a long road to reach this milestone..my current 4 year supply is all oak,Red,White,Burr and Black..I have approx.25 cord split stacked and covered and another 10 cord waiting to be split and stack as I rotate out....I just loaded for the night on a good bed of coals with some 4 year old well seasoned White Oak....and as usual it took off immediately...start to finish approx. 10 minutes...pipe temp is 600 and the cat is running 1200...one final tweak before I turn in for the night...How you or @webby3650 do it? Will be good to know. I burn hot on reloads and I have to accept that not always I go for those 30 minutes. I go sometimes for visual of how I see the fire and the stove probe temperature plus flue temperature. Of course not always is those 30 minutes, can be a lot less for sure depending on those reasons mentioned before plus burning softwood and dry that catch quick.