I found some great info here on vac pumping.. check it out
http://www.refparts.com/Catalog/Tool...cuum_pumps.asp
I had NO clue you had to vacuum THAT long to get a proper dehydration of a system.. wowzor..
That is why I like to use my MAPP gas torch as well.. just to light heat the lines up.. it really whips the lamma's ass then.. cuz you have the water basically boiling off from your torches heat alone.. w00t