Lap times - cycling

I was out riding the streets in a 7 mile loop. I did 3 laps and each lap is about 27 minutes for me. The virb chops up each video into 23:57 minute segments, although its all one ride. I noticed there is a template for lap time. I don't want to compare times on the whole 7 mile loop or 27 minutes, just a 2 minute segment, which might be the problem. But how do I set the start and stop of a lap? or is start and stop the same point? Because then I have trouble because 1 lap is longer than 1 chunk of video.

Honest, if you guys are going add any features for this. I would love to see a virtual display of previous laps. That way if I'm looking at video from one lap I can see a graph in time of the linear position of other laps. So I know what slowed me down or what helped me gain position.