Not totally sure of the time involved, but drain time can be significantly effected by a number of things, how full is the tank, how many gallons does it hold, and similar items. I had the tank in one of my trucks out in about 2 hours total, I believe, and it was relatively empty, so not much had to be drained from it in order for me to remove it. Shouldn't be too bad of a project, unless the fasteners that attatch it are frozen together, in which case it can add a considerable amount of time, and a few cans of Liquid Wrench to the total project cost. /wwwthreads_images/icons/smile.gif Good luck with it!
/wwwthreads_images/icons/cool.gif '79 GMC Suburban 4x4 and '85 GMC S15 4x4