just using as an example:

Shauna has a score of 2"48'29
Mirage submits a score of 2"50'41

When Mirage submits a score, I will inform him that he is 0"02"12 behind the next player and encourage him to try and beat that score. I will probably have a table like this

Name Time
Shauna ?"??'??
Mirage ?"??'??
Benchmark time 3"30"00

Should encourage players to see a benchmark score and to submit scores to beat it.