If that is the case, then what is the correct duration that one has "bought" with their drink? If I buy 1 ice cream every 30 minutes, does it mean that I'm more entitled to sit there compared to a person who has bought 1 ice cream for 8 hours? If I bought a Big Mac meal upsized, does it mean I win more minutes in the establishment?
Where do you draw the lines? Who decides? You? McDonald's?