Wont hurt to put some sort of protectant on the plastic parts. 303 aero space protectant seems to be very popular.
As for wax? Mcguires Rv/Maring is some good stuff. I just got my first can of Collonite Fleet Wax. Only did one small test piece, but from that the results look pretty spectacular.
Me? Couple of hours. DW? Couple of days. Of course, if we left with just my preparations, we'd be missing a few important items and a lot of desired items. I'd make do, but that's not an option ;).