I was a professional mechanic for a number of years and have a small selection of air tools. A good example is using my cutoff wheel. I'll get about 45 to 60 seconds of cutting time before the pressure drops to a point that affects the tool's performance, then I spend a few minutes waiting for the tank to fill. Spend more time waiting on the compressor than working with the tool. Air tools I have: 3/8" ratchet, 3/8" impact, 1/2" impact, 3/4" impact, 1/2" drill, cutoff wheel, die grinder, air hammer, and reciprocating saw. They're all pretty much useless for a decent sized project with the 12 gallon compressor. If I only need to use one of those tools for a minute or two, what's the point of even turning on the compressor?