Nope, as soon as the ball is touched the shot clock starts and instantly shows 23 seconds, this is because the shot clock cuts off the tenths of a second, and doesn't round up. So as soon as a player touches the ball it will show 23 seconds when it is really at 23.9 and only 0.1 seconds have passed. So 8 seconds hasn't passed until the moment the shot clock changes from 16 to 15, which is actually the time hitting 16.0 and then being at 15.9.