I know the concrete is supposed to reach it's rating in 28 days ie - 3000psi concrete takes 28 days to reach that rating, but to wait that long to drive on it seems rediculous.He has a Mustang in storage that weighs 3200lbs and I figured he'd be fine driving it across the driveway into the garage after a week of cure. would wait a week to drive on it and a month to park on it, a mustang only weighs 3200lbs its not a 1 ton truck. Besides concrete guarantees you 2 things, 1 its expensive and 2 someday it will crack. __________________. A car takes 8940 bolts to be put together and only one nut to scatter it all over the road!!!!