Shoveling a roof?

Please serious answers only!!.. How much would you charge to shovel a roof? Im talking a LOT of snow off of 3 roofs.Then the decks as well. This is about 5-6 feet of snow. Harnesses and all. Not to mention we have to hike 2 miles to the place in the snow as there is no access in the winter to get there.
Update: actually we are doing this for my parents..if we don't the roof will probably collapse soon. my bf does this but we are just wondering what to charge.. as a fair price..
Update 2: Well i should say he CAN do it.. just doesnt know what to charge
Update 3: Actually we are in Crested Butte,co.. we normally DO have snowmobile access but we can't because avalanches have blocked the road.
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