Use the Victory time.

Fastest single boss clear · Victory-screen time

1. Start fresh. Record before entering a new attempt.
2. Kill the final boss. Keep recording through the rewards until the game displays the Victory screen.
3. Use the game’s Time. Submit the exact Time on that screen as minutes:seconds, such as 4:51. Leave the results visible for a few seconds. A LiveSplit overlay is optional and does not determine your rank.
4. Show the whole run. Submit a publicly viewable, continuous video from setup to Victory. No external speed changes, cheats or spliced recordings.

Reviewers check the clear and the Victory-screen Time. Equal times share a rank. Older manual times need a Victory-screen check before ranking under these rules. This is a community leaderboard.