My trip to the office is 50-60 miles one way depending on the route, but i do it only once a week. After 8 months I am still not tired of it, actually every week I am looking forward to that ride. I wouldn't wish to do it more often than that, it would become a chore pretty quickly.

But like OP says cycling is cool, so couple of times per week I would just go for a ride in the evening, some 50km, and once a week we do it together with my wife. That is just the right amount of cycling for me, and leaves plenty of time for being with my family etc. It also allows me to pick more interesting routes rather than riding always same paths.

Riding to work once a week brings a lot of Ahs and Ohs from my coworkers, so I have no problems with the sense of accomplishment. Actually in my case it's far easier than they imagine it, but I keep quiet.

Like many have suggested already in the OP's situation I would ride once or twice a week for few weeks in a row and see if that's enough. Another option is to move closer to your office or change the office. Option 3 is to go to the office less frequently and work from home few days a week (that's my approach). Of course a lot depends on what sort of job you have, etc. You have a better idea what fits and what doesn't.