[r0ver]

As the other version was a bit easy.
Assuming your colleague leaves at around 3 every day.
Start edging at 2:30 (if not already)
At 2:45 roll 2 dice.
You have that many minutes to cum. However you are to stand so that your colleague could see you if she turns around. And you must be blindfolded.
For every minute over or under the time it's an infraction.
If you stop before cumming it's 5 infractions and the number of minutes left until your colleague leaves is an edge you must complete in the staff car park