Test run and the end results. Washed: 5 towels 3 hand towels and 3 wash cloths - exact same towels in each load. Both loads were washed on hot with the spin cycle between medium and extra high Both loads were dried with dry flow sense - very dry setting on medium temperature Before each load was dried a different load in the dryer and cleaned the dryer lint trap. So the temperature would be the same starting temp. The same amount of laundry detergent in both loads and did not use laundry softener in either load The first load with NO dryer balls took 58 minutes The second load with 3 dryer balls took 42.5 minutes. That's 15.5 minutes less drying time in the load using 3 alpaca dryer balls Using 3 dryer balls cuts down on drying time by 25%.