I smoke at whatever the outside ambient temperature is. If I know it will be 80F or less outside, I'm good to go.
I don't observe any real increase in temps inside the Smoke Hollow from the chips and soldering iron, maybe 5-10F gain. I used to measure it, but it's not worth the trouble.
Depending on what kind of wood I'm using, a can of chips smokes for about 1 1/2 hours. I ususlly put on a glove and shake the can up about halfway thru. One refill of chips and it's still making smoke at the 3 hour mark.
Pretty much, plug it in and forget it.