One butt or two doesn't seem to make much difference for me in my 1400. I plan for 18 hours. I start at 11 pm with a light timer, at 200 overnight, then crank 'er up to 225 when I get up in the morning for work. At that point, I unplug from the timer and plug directly to the outlet. The timer has done it's job. Watch your internal temp, but with this, I'm usually hitting 203-205 right about 5 pm. When I get home from work about 3:30, I should be out past the "stall" and starting to climb. If so, I consider myself to be "on target" if I'm still in the stall, I'll wind 'er all the way out to 250 to help it along. You could probably run a little shorter by running it wide open for the whole run, but it always seems like I'm trying to hit a target time and need to play with temp to get there.
I believe in catch and release fishing. I don't want to EAT 'em all, I just want to GREET 'em all!