CS people are probably in a somewhat unique position where that is somewhat possible. If you study something that isn't tied to a specific industry or where you need many years of training and certification to become useful that's not so tenable.
(Even McDonald's was paying more than minimum in my area.)
For example in my hometown it is still possible to rent a flat with a friend for less than $400/month meaning single people can survive on very little
Ok, so from the chart, on minimum wage you'd work 10 hours per credit, at twice the minimum wage you'd work 5 hours. For 2013 you'd work 60 hours at minimum wage or 30 hours at twice the minimum wage.
I'd say there's quite a difference between 5 and 30 hours either way?