Its 10,000 sq, ft. Coat of primer on gutters 2 coats on walls

Is 10,000 sq feet the total wall dim or the inside dim ?

Are you spraying it ? Are you using scaffold ?

First find out the coverage for your paints, then you can estimate the quantity and cost. Is there extra surface preparation required? Think seriously about it you might be able be able to estimate how many square foot you can do in a day. I think I could do about 400 sq ft in a day without scaffolding but I might be slow. Spraying would definitely speed it up but then you have hiring cost and a different rate of coverage for the paint