Well I don't "vaccum" so to speak. All my tanks that aren't bare bottom have sand, so I never really need to do anything else with those but remove water. All my bare bottom tanks ya just take a min or 2 and suck all the stuff up off the bottom. I can do all my tanks in 2hrs or so. 4 (10) gals, 20gal, 29gal, 30 gal, 38 gal, 40 gal, 55gal, 75 gal, and the little 4.5gal.