How many gallons does this sprayer take at a time.? How long can it work at a time?

The container on the Control Painter holds 1 1/2 quarts. When you are spraying the sprayer will get a few minutes rest while you are refilling the container so you should not have any problems. Feel free to call us at 1-800-328-8251 if you would like to discuss this or have further questions.