I'd try to keep both developers within a degree or so of 105F. When I tried to use colder temps according to the chart the results were not so good. The blix temp doesn't matter so much I don't think. The instruction sheet claims you can get about eight 120 rolls from 32 oz. Best to store in full bottles. Even then, the shelf life once mixed isn't that great. About a week ideally. Maybe two weeks if the results are not too critical. I once even used some that had been mixed a month earlier. The slides came out but there was some major color shift--not recommended unless you just want to experiment for the heck of it.