Looking at the results from last year's SITS, there's a lot of solo riders finishing in 24:00: and a few seconds.
Why do they do that ?
You don't "have to" go out for another lap if you get back in under 24 hours, so why not just finish then instead of hanging around to cross the line after the 24 hours is up ?
Hypothetical situation…
Rider A has done 9 laps. At 23:50:00 he is 1km from the finish. He doesn't feel like doing another lap so he hangs around and crosses the line for 10 laps at 24:00:30
Rider B has done 9 laps: At 23:55:00 he is 1km from the finish. He puts in a final sprint and crosses the line for 10 laps at 23:59:59, then retires without taking the opportunity to do another lap.
Rider B was 5 minutes behind Rider A, but has now moved up one place on the results. Why didn't rider A hold him off by carrying on and finishing at an easy 23:59:00 ?