Now we are up to 600 strokes - but this time I want you to time yourself. Your time is important. You don't have to go super fast, but a nice moderate pace that you can maintain and endure. I also don't want you edging, and definitely no cumming. If you edge during these 600 strokes, you must stop and rest, reset the timer and start the 600 again - so I suggest that you do it right the first time, unless you want to keep having to restart.
If you don't have a stopwatch, use this online one http://www.online-stopwatch.com/
Once you have completed the 600 strokes, press continue.