Gosh! How quickly do you want to grind coffee beans? This little gizzmo whizzes up coarse in 8 seconds, medium in 12 & fine in 16 seconds. The only thing is that you, as the operator, have to judge how long to hold down the press-button switch but once you've mastered that plus watching progress through the transparent cover, it literally only takes seconds to produce enough grounds for "10" cups as marked on my drip coffee maker or, if you like to drink from big mugs like me, enough for 4 mugs.
Suggest new users first count to 10 before letting go of the button and then vary their count according to taste.
Would be 5 stars but the simple push-button switch is not idiot proof. Nevertheless, great value!