Interesting theme indeed. In general I started counting time from the first call, until the last call.
In my wild and carefree youthful years as pioneer a lived in district that was quite big geographically, even it was kind of city/metropolitan area. I could start with one RV in city center and then as I was cheap took the bus with my year card to northern part of the city to another RV. Busride would take some 45-60 minutes, and taking train with just 30 minutes was not a option for me even the year card would have worked there too. Obviously next RV would be in eastern part of the city, bus ride there would take some 70 minutes as there was need to switch the bus. You guessed it right, next RV in western part of the city and the ride would take some 80 minutes. If I was in righteous mood, I could then do some door-to-door activity there to call the day. Counting time whole the time ofcourse. Short coffee breaks was not deducted, but full-scale lunches would be.
The good thing with all this was that me and my current wife could really learn to know eachother even be slightly affectioned, riding bus and counting time.
CP