When I sprayed I could spray 400 gallons with little problem. I'm wanting to be fair with a goal for my employees to reach but wonder at teir results. How many gallons or do you have a quota or know what others require for their employees to spray out. I have about 300 customers all within 10 minutes of my office. I have a 500 gallon tank which I fill in a couple minutes by fire hydrant. We spray 3 gallons/minute pressure.