BigS,
I think it will come down to trial and error. I have typically heard that about 4hrs is it. Reg is probably correct also, I can't believe having smoke after 4hrs won't some type of difference. It's probably going to be a thing a flavor preference. I typically only use 4hrs and the amount of flavor is just fine for me, I get to many compliments to do anything else. One side note, in the past I have enjoyed mesquite. My first smoke with the BS was the Christmas turkey, I used mesquite(the devil's wood) and it almost made me never do a turkey again. The power of the Bradley mesquite smoke really is powerful, if I was to use it again I would certainly use much, much less. Said all of that to say this, it's a flavor thing and not how much.
SmokeOn,
mski
Perryville, Arkansas
Wooo-Pig-Soooie
If a man says he knows anything at all, he knows nothing what he aught to know. But...