Hmmm - the "KJM Blend" is usually 10 or so (depends on how cold it is!) minutes. Ive always been surprised at how even it is. I might have a go at extending it to see if I get spotty results..
Id love to know how it is that the roast of such a diverse mix can end up so even. Very interesting data point there Matt. Youve re-piqued my interest in sorting out what is going on!