"edit" lap functionality for Garmin Connect/GTC?
 

Hello all,

So recently I did a century with some buddies of mine. We were dead set on doing the century in 5 hours, and so I decided to make my Edge 500 auto lap every 20 miles. This would have worked great, had I not decided to press the "lap" button out of habit for each of the 3 rest stops. So my question to all of you is, is there a way to edit or crop a lap? i.e., if the lap is x minutes long for y miles, is there a program/site that I can use to crop said lap to be only z miles long to get the minutes?