The rules say the run ends when you complete puzzle 1-L. Does that mean as soon as the animation at the end starts? or when the cutscene that says "Congratulations" appears?

Right after the screen goes away showing the end result of the Picross puzzle

So after you complete the puzzle, it shows a large color version, then fades out, then shows a small color version, then fades out again. So at the end of the small color version's fade out is when the timer ends?