Wouldn't it make the most sense to use in game time for Individual Levels? It would be the most fair way to compete and it avoids some weird situations where the faster runner is placed lower on the leaderboard. An example is https://www.speedrun.com/ssbu/run/zxgnv38y vs https://www.speedrun.com/ssbu/run/yd69npxz. The first user was objectively faster but is placed at 5th instead of 3rd.