When riding Petit Boucle today, when going up towards the Ventoux summit, the game thought that I was doing the Marina Sprint, but obviously going away from it the finish point kept increasing rather than decreasing and the time continued to roll. It only went away when the route turned left down the Petit KOM
After completing the route, I pulled a Uey and went up Ventoux - the same thing happened, but the Marina Sprint window kept rolling all the way up (until I spun back round after an hour).