The 5th time score!
(a photo is uploaded. please check her official site)
I got 14825073.
I got all the way to this score the fifth time I played the endless marathon mode, but the game was over the moment I felt abandoned and thought "Oh, no, I've had enough of it!!" (lol) I'm embarrassed to have shown you those two scores in my newbie-player era here~!
From around the LEVEL 200 the sensory speed becomes consistent, so I think it really boils down to a matter of "motivation" . . . You could play it forever with some pauses in between to drink water, stretch, go to the toilet and refresh your head, I guess.
I kinda don't see any point in going for the higher records, but I may give it a try expecting some surprises, as a Tetris maniac . . .