Two gallons should be more than enough, but it all depends on a few factors.
Are the walls primed? New drywall will suck up the paint.
Are you covering a dark color with a lighter one? This will require more paint.
What color are you using? Reds have a lot of translucent pigment, and therefore they don't cover well. I used an entire gallon of red paint for a small powder room.
Get two gallons...that should be enough, and you'll have enough left over for touchups in the future.
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