I have been running the game recently and I originally thought you end the timer after the final cutscene. Then when I relied that was not true. Then I started ending the timer when you see all seven scrolls during the final cutscene. And when I summitted a run I ended the timer two seconds late. Please help me with this :(

Time starts upon selecting "yes" on A NEW SAVE FILE CREATION MENU or when clicking the orange play button on the title screen. Time ends when the border of the final sports cutscene disappears (the border around the screen will quickly disappear and reappear).

I also recommend watching top runs with timers and just seeing when they are paused.