I'm surprised that the roof cleaning is costing some so much time! I'm doing it about every two months (so I can watch the roof bubbles closely), and a complete wash is taking me about 20 minutes. We got one of the blue extend-o-handle wash brushes at Wal-Mart. I've seen the exact same brush in several Wal-Marts for about $17 in the RV section. The bristles are frayed (real soft!) so they won't damage roof or side finishes, but do a great job of cleaning the entire exterior.
Now, waxing the house......that's a WHOLE different story!!!