I was wash my Lib myself, the whole process takes 1 to 1.5hrs! But some times I give it a quickie 30-40mins.
Believe it or not I use baby shampoo (Johnson & johnson no more tears) it works very well. I got that advise from a locally car detailer who said the best way to wash your car is just using water, no car shampoo. otherwise if it's really dirty use the baby shampoo.
The baby shampoo hasno harsh chemicals that slow erode paint work.