I can honestly report that all the time I was a pioneer, I did not ever see even one circuit overseer who did not play all the "fs time games" that have been mentioned here on all the other time-cheating threads.
One obvious way was jumping out to "start your time" right down the street from the KH, and then driving off for miles into the rurals before hitting another door. Same thing in reverse after the drive back. Another was loading up as many people as the car would hold and having all of them cool heels while one or two did "return visits".
Long after I was out of the JW, and unrecognized in another town, I listened in amazement as a Circuit Overseer sat and gossiped during a field service break with about 5 or 6 witness sisters for the best part of an hour in some restaurant. He was going on and on about what new printing presses they were getting at bethel, kingdom farm, etc etc etc...