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I have a 5hp with a 30 gallon tank and you can work for about 3-4 minutes then wait 10 min for pressure to build up. If you want to sandblast large areas rent a portable compressor that is powered by an engine. You can work until you run out of sand non stop.
If you haven't used a sand blaster before, be sure you practice on something other than your Mustang first, or consider using media such as walnut shells. The sand can warp thin metal in a hurry.