7 hours sounds about right....I did the 3 step after washing the X about 2 weeks ago...had a power buffer and still took like 6 hours...So many nooks and krannies where the mud hides...biggest one I found on the '00 X was on the outside of the inner wheel wells where there is a little shelf...had to be an inch thick of caked mud all around....I couldnt believe what was in there...there was was still rocks and dirt from my trip to Labrador 2 years ago!!!