While I cannot speak for Great Lakes, I did work for Air Midwest (a Mesa Air Group company) and the schedules were similar. We would usually work 3-5 days and get 2-3 off. Once in a great while you might get 4 days off at a stretch. The days are typically no less than 5 legs and can go up quite a bit from there. I once did 14 in one day...without exceeding 8 hours! Commuting at companies like this is usually a tough exercise, but can be done. You'll eat up a bunch of your time off each week.