I believe the minimum time and maximum weekly points were part of the WW US plan in the late 90's. I remember reading through my Mom's old paperwork when I started weight watchers the year before last, and going "Oh wow! I'm so glad it's not like that anymore!" That was back in the day when you had a range each day, and could bank points for special events (the plan before Flex, maybe 1-2-3 success?)
I know that the Weight Watchers plan also varies outside of the United States, so it's best to follow one method consistantly; whether that be the current US Flex or Core plan, or another plan from Autralia or your mother's attic
-Amy