First you have to understand the why of stropping, only then can you figure out the how. Does it take 300 laps or 60 laps? Why not 350 laps? Or is 20 enough? You need to establish a goal, then you need an objective means of determining when you've reached that goal. Just counting laps could cause overshooting, or undershooting, of the goal either of which could lead to frustration and/or a waste of time.
If you've experimented a lot, and some number of laps seems to consistently achieve a good quality shave, then stick with that. Or, there are other methods such as the HHT and the thumb test, which can provide even more objective feedback. Whatever you are most comfortable with, and works for you.