Unfortunately, I was able to convert two persons at my high school. It wasn't field service per se and I did not count my hours (as I could have) but it amounted to the same thing.
I was an introverted person who found it extremely difficult to engage others in a normal conversation. Like most others, introverted or not, I wanted to simply count my time placing magazines.
In actual field service I got to the point where I was beginning to have anxiety attacks. One night I was with a brother approaching people in a retail establishment's parking lot. We were scaring people who apparently feared that we might be robbers. I ended up telling that brother that there was "something wrong with this". He agreed with me thinking that I was referring to myself, not our being there.