Up until the early 1970s, the WTS used to set specific goals for "Regular Publishers" , which included 10 hours per month, 12 magazines , so many "back calls" (now "return visits"), and at least one bible study. Those failing to meet these goals were classed as "Irregular Publishers", and would have received some "encouragement" in the form of a cattle prod!
I'd up my hours by putting leaflets through doors as I walked to work.