Couting time and, how to count time while doing as little service as possible is often a hot topic around witnesses. I even overheard pioneers discussing about it.
They call it "creative time counting" (I translated that phrase from a different language so bear with me ;-). I wonder how many pioneer hours are real hours in service. They even developed a technique called the "pioneer walk". This is walking as slow as possible while you are in service. They say this is to finally appreciate what Jehovahs did around you, like the nature. But why do that while you in service? Do it on your "own" free time. Not while you are counting hours.
Often when two witnesses go in service, even when they spend the same amount of time doing it. It can still result in writing down a different amount of time because some are more creative than others.
So there was this pioneer in my home congregation where I often would go to service iwth, he would always choose the territories that are outside the city with a minimum driving distance of 30 to 45 minutes. After a field service meeting he would drive to a nearby super market and start there by offering the magazines to a random stranger he then would proceed to drive the long distance to the territory and count it as time. On his way back he would make the occasional phone call to one of his studies (if available) or some other kid in the congregation. So while my concience would only allow me to count one hour, his concience allowed to count up to two hours or more.
Then there was this pioneer brother, still a kid basically and newly baptized. He was the new star in the congregation. So I went with him in service in a territory so after awhile we got hungry and went to a fast food place. So while I was still ordering he chose to sit back as far from the counter as possible. I thought he wanted to make sure no other people where sitting next to us because he wanted to tell me something. Then as I approached the table with the food I saw that he placed a Watchtower magaine on the table. So he STILL counted that as time spend in service even though noone possibly could have seen the magazine!
Then I know many sisters they go street witnessing on streets with a lot of shops. And they call it "ministry shopping". It is the art of going shopping and still squeeze a little bit of informal witnessing to still count the hours as a whole. Not sure if many pioneers are doing that, but I know at least of a former pioneer sister who did exactly that a few times.
I am sure you have your own stories how somebody can as many hours as possible while at the same time doing as a little as possible preaching.