In GB version loop ends after you save the girl.

In JP ver. girl gets kidnapped after 1-3 and you save her at 1-4, but in US ver. kidnapping is after 1-5 and save is at 1-6.

Since everyone here played on US ver. and stopped after "elevator descends to the bottom of Level 4" that means that not a single person on this leaderboard completed a proper 1-loop run.