Until about a year ago I was working 10 & 12 to 15 hr shifts. Walking at least 6 miles a day. Work is only a 3 mile commute but I'd do a 15 mile loop coming home. Through the winter. 63yo,btw. That said, my current schedule is back to back 19+ hour shifts with 5 scheduled hours off between. I don't commute for these shifts, need to bring pillows, blankets, etc. OT shifts still ride. I do get in a 3 to 6 mile stint on the rowing machine between those shifts. Not unusual for me to get in a 25+ mile ride once I get home.

Bottom line, go for it