I won't even pretend that I can DO this. However, after wading through the many replies and looking at a pair of external sources, now I at least understand the procedure. I'm gratified to now that so many really do understand it, but a little surprised that the 'Official Company SOPs" vary so much. My sense is that virtually no one really does this with a stop watch anymore, deferring to the Magenta Line. And one of these days that little line will go Tango Uniform. Is this procedure still required for annual and semi-annual SIM qualifications? If not, perhaps it should at least be done, even if not part of your official evaluation. Great question!