These people is really stupid and dumb. Everybody I know uses coffee MUGS, not cups. A cup of tea but not a mug of tea. Are these people living under a rock? How many cups in a mug?
That depends largely on the size of mug, now doesn’t it?
I guess you have to have some sort of unit of measurement.
Me? I have mugs that are about 8, some 12, some are 24, some 36.