It depends how thick your layer of paint is.
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4 l of paint will cover about 34.5 m²
A square unit is equal to 100 square feet so 2200 square units equals 220,000 square feet. One gallon of paint will cover approximately 400 square feet which means 550 gallons of paint are needed. If you plan on a double coat 1,100 gallons are needed. It will take 550-1,100 1 gallon cans of paint to cover 2,200 square units.
root 484 ie 22 feet
The answer depends on the preparation of the surface to be painted and on the paint, itself. Read the coverage information on the paint can.
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