The leaderboard in Clean The Library appears to change based on your run time, so it updates when players finish a cleanup and post a new best time rather than on a fixed daily reset. The game’s description and guide both describe it as a race for the fastest cleanup time on the server leaderboard, which points to a live, run-based leaderboard rather than a scheduled timer.

What that means

  • If someone beats an existing time, the leaderboard can change right away.
  • In co-op, the leaderboard can shift after a team completes a run.
  • There’s no evidence in the sources I found of a set hourly or daily refresh cycle.

Practical takeaway

If you’re trying to rank up, the safest assumption is that the board updates as soon as a new qualifying run finishes. So the leaderboard may change a lot during active play sessions, especially right after someone gets a faster time.

Note

I didn’t find an official Roblox or developer statement giving an exact refresh interval, so this is the best-supported reading from the public info available.