Everybody's body is different and pending the type of poop you had, cleaning time will vary. Generally, 5-10 seconds is more than enough to get clean.
After a few uses, you will become a pro at hitting the bulls and slightly adjusting your body position while rinsing to thoroughly clean every nook in your cranny.
After you complete your rinse, use just a few squares to dab dry and confirm your cleanliness. If needed, rinse and repeat.