I recall moving to a new congregation after having "served" as an MS in my previous one. I was working Saturdays, so I could do "only" an hour of witnessing Saturday mornings before I had to leave for my job. Sundays was never much fun because the pioneers all teamed up and left me to work with the smelly old women who had nothing else to do with their life. My monthly total was about eight hours. One arrogant young elder asked me if I was keen on becoming an MS again. I told him, sure ... I did actually like to help people in the congregation. He told me, "Well, if eight hours a month is all you can do, you're really wasting your time, because it's not enough."
It was actually a revealing, and ultimately helpful, response. I immediately decided that if I was wasting my time spending eight hours a month annoying people at the doors, I could just as easily waste only an hour a month and claim I was doing two. I never reported more than five hours a month from that day. It was one of those eye-opening moments that, looking back, helped to pave the way for my eventual exit.