12 hours per day is only possible in short bursts, not sustainable in the long term. However, I wonder how would that 6 hour work day compare to working just 3x

12 hours per day is only possible in short bursts, not sustainable in the long term. However, I wonder how would that 6 hour work day compare to working just 3x12 hours per week. So, 3 really long days of work and 4 days of leisure time in between. I know I would really like such schedule.