Back in the day - yeah, I know, most things I write start like that! However - back in the day there was an implicit rule ratio of 2 to 1 when it came to counting time.
Two witnesses witnessing to one person for one hour would count one hour each. Two for one! One hour received by the householder and two hours counted on the Report Card. So pioneers used to love accompanying publishers on remote Bible studies to ramp up their hours.
So today I finally answered my own question when I observed two witnesses attending one (very depleted) witness cart at one end of our local High street and another (also very depleted) witness cart about 100 yards away that was attended by one lone JW.
Clearly, 3 dubbies had turned up to man the one witness cart. But rules being rules about counting time, they'd gotten by the 2 for 1 rule and split the display in half. BTW, it was also as windy as hell in the High Street today, I didn't see anyone else between the 2 carts apart from me. Obviously these three guys were gonna hang in there, literally holding on to their hats and drinking from their Thermos flasks until they'd got their time in.
What a daft way to live.