In my early 20s, I'd sometimes ride 19 miles to work. 90 minutes uphill in the morning. 60 downhill in the evening. I only did this once or twice a week at most though.

For the distance you've got, I'd consider an ebike. You'd still get a workout but the motor will really come in handy on those days when you're not at your best or otherwise disinclined to ride that day.