I knew a guy who pulled a few 20 hour shifts. Another dude I worked with slept on his off days, because he was in community college finishing up his associates and he was terrified of going into debt when he went to university. His days were class from 9AM-1PM, Homework from 1PM-4PM, our job from 4PM-11PM, ??? from 11PM-2AM, and Fedex from 2AM-9AM