"Today is a 10 hour day.  I am on hour 6." He smiles. "So about 4 hours left." As he is talking several people walk up with rc cars, one a 4 foot tall 7 foot long dragster. "Oh boy, we are about to get extremely loud." He says and walks inside the shop grabbing several head phones. "You will need this." He says and walks over to the dyno, preparing it.