Most 后院 you cannot drive through, so you have to dump all the materials on 前院's driveway, then transfer them by weelbarrow to 后院; of course, you have to transfer the dirt and sod dug out from 后院to 前院's truck by wheelbarrow as well...
I had a guy to do my 后院, 200 sq ft area, from digging to finish, took him about 40 hours (last for two weeks)...it includes dumping 5 cubic yard gravel and 2.5 cubic yard stone dust and 50 2'by2' slabs...