Of course, this is a 50km/50km commute. But, that second commute in the same day is still a bit of a drag. And, yes, there is that "day after" feeling and the day after that coming too.

An option would be to also plan on a morning and an evening ride not necessarily part of the commute (driving/bus/train/etc). Go for a 20km ride before work, then a 40 km ride when you get home. And, slowly increase the distances. No sleeping in the next day.

Another option as you're ramping up would be to start doing the commute one or two days a week. For example, choose either Monday or Friday to do a 100km RT commute along with your normal work routine, then do your normal commute method for the rest of the week.

Add more days once you're comfortable.

Keep in mind that many of the people who have responded that the ride is theoretically possible also regularly do 100 mile (160 km) rides, or even 200 km, or sometimes 300 km rides. Longer? But not necessarily on work days.