If that's not how it works, it wouldn't have been recommended as much as it has. When I did it, I wasn't sitting there watching the screen the entire time. I quit after about five minutes and just shut the television off, checking every ten minutes if I wasn't wanting my character to actually level up while as that vocation.
https://www.youtube.com/watch?v=0ztaVLMz8EY
To get the most DCP per kill, the XP gained has to be 100 or less. If you were to solo that, it would be even slower. The person who recorded that video seems to be using a three person group too, which is why he's getting 101 per kill.