Perhaps, you could have an "average time/score" that would appear in the leaderboards. As the name suggests, all the times on the specific level will be added up and divided by how many there are, thus giving us the average. This would be good to have to show players on whether they have done better or worse than average.
Maybe it doesn't have to be just levels as well. Perhaps it can be an average for the total time it took to beat PQ's levels, or MBP's.