The society wants you to track every minute possible, so they can add it to the grand total. The more hours they can tabulate, the more proof they have that the JW's are the ones doing the majority of the preaching work on the planet.
Why not count your time, from the minute you see your first fellow JW at the KH? This time should count. All time that you are spent isolated with JW's, is indoctrination and control of your thoughts and actions. You are under the protection of your brothers and sisters, and will not be influenced by worldly people or their twisted thoughts, as long as you are in that car group.
They want to make it easy for publishers to get points for their time cards, so they will want to become pioneers. The more pioneers, the more proof they have that they are growing in their faith and that Jehovah is blessing the preaching efforts.
It all boils down to controlling the flock. Keep pushing them to report more time, so they will spend more time being isolated and controlled by JW's. Keep them separate from reality, so you can convince them that they are the chosen people. They are closing ranks, and they want to squeeze every last ounce of independence out of the sheep.
It is a cycle. You report more time, you feel like you accomplished something. You compare numbers with your friends, and get a little competitive spirit. It's human nature. You want to strive for higher numbers, or at least maintain each month. I think every seasoned JW realizes how little fruit is produced from the door-to-door preaching work. It is all about numbers on the card, not reaching out to unbaptized people.
The confessions and observations made here, and by active JW's I have met (my parents), tell the real story. The preaching "work" is a joke. They report time to be recognized by men. The reward for putting in your time, is advancement and privilege within the organization.
They claim that this preaching work is what proves they have the favor of Jehovah God, but the opposite is true. They are running around deceiving themselves, and anyone who is courteous enough to answer the door. If JW's were allowed to stay home on a Saturday morning, they might be tempted by unwholesome activities. They might even go online and see that there is a big wide world out there, or they might read a book or take up a hobby, or even *GASP* visit with unbelieving family members and friends!
EVERY minute should count, whether your mouth is full of pastries and coffee, or if you are regurgitating the lies of the WTS.