How long will it take to drink a gallon of water if you every ten minutes?

It will take 2 hours and 40 minutes to drink a gallon of water if you every ten minutes.

A gallon is 128 fluid ounces. If you drink 10 fluid ounces every 10 minutes, it will take 128 / 10 = 12.8 hours or 2 hours and 40 minutes.