46742 frames and 7625 rerecords from power on to Metal Man death.

The glitch you see at the end relates to breaking the screen scroller. If you don't press right at the right frame during a zip and you hit the edge of the screen, it causes the game to think Mega Man is on the next screen but all the enemies are from the previous screen. In most cases doing this at the end of a stage will simply drop you in a void, but there's an extra screen of data after the boss room and you can stand in a perfect spot to hit Metal Man from above with it.