[sswee]

It's 720min \ 4.5A x .5 mil (from .1 to 1 mil) = 90 min. run time

You mean 80 min run time?

Great info SS! I'm a newbie reading all I can here.

Yes it's 80 minutes. Didn't have my reading glasses on and misread the calculator. It's all easy after you know it. Sometimes not easy to get a handle on it in the beginning.
SS