Ran it for about 1 minute or less.  Just long enough for fluid to stop coming out of tanny pan.  I got a lot of it out,  a lot more than 4 qts.  If you are familiar with those large buckets that cat litter comes in, probably 4 gallon bucket, I filled it half the way up, at least, with the old fluid.  
  
Smoke (lots of it) coming out from under car, and oily film now on back window. 
Just hope I did not screw something up that I can not fix easily, instead of paying $40 hour to get it done by some schmo.