We (Froggys Fog) had one at the show. The 25 pound tank that they strapped to my back lasts about 3 minutes or so. Thats why you do quick short bursts of it. Depending on your actor depends on how much you will go through. Also depends on your account with AirGas but its on average 20-25 dollars to refill the tank. I wanna make sure you also know that you have to train your actor on how to use the gun....make sure they know not to shoot it at peoples faces as shards of ice sometimes come out of the gun.