JimL, if you did clarify it, you would be the first.
I once had occasion to develop a database for recording just this kind of information. I had quite a lot of rework to do when AIC 79/2002 (we're talking UK here) came out, mandating the recording of rotor start and rotor stop. The effect on the Company in question was that the average recorded duration of a bog standard 206 sector would increase by 5 minutes - while not actually changing at all.