[Timer Start] When the timer shows 0.03, the edge of Course 11 is not yet red. This means the timer starts at least 0.03 seconds faster.

[Timer Stop] Timing ends when the pop-up after course 20 is visible at the bottom of the screen. At that time, the timer shows 1:41.53.

1:41.53 - 0.03 = 1.41.50