4 1/2 hours ,doesn't sound like a lot of time but try holding a 2 1/2 inch high pressure hose with 90 psi at the nozzle for 4 1/2 hours and see how you feel i am beat. every thing cleaned up real nice. but the engine compartment,was a PAIN IN DA BUTT!! some one painted it with some kind of rubberized painti like to never got it off. i used 5 bags of sand just there. i didn't worry about removing all the brown primer because it was already blasted under it. now comes the chore of spinning and vacuuming until i get it all out. the next step is seam sealer on all the seams. i hope tomorrow.