It's a great way to hours in. I know a few people who go up to Chelmsford already on a part time basis (once a week or so). They are pioneers and are able to count every hour they spend, including travel time, towards their allowance.
They leave around 5 am and get back around 8 pm - 14-15 hours per week.
So that's the vast majority of their monthly target done doing NOTHING towards the preaching work but the figures still go into the pot and they still can walk around the KH and RC with chubbies on boasting about how much they do in "scared service".