Because pumps all pump differently, and head, bends, and other factors all come into play, you may just want to do a personal assessment.
Hold a measuring cup under the flow to your tank, and time how many seconds it take to reach what ever mark you are comfortable with (8oz, 16 oz, whatever.)
Lets say it takes 1 minute to fill that 16oz cup. so 16 oz into 64 oz per gal
So in this example it takes it @ 4 minutes per 1 gallon.
4 minutes into 60minutes per hour = 15 gallons per hour.