Congrats! At least now you have a better estimate of how long it will take you - and it will only get faster as you get better at the hills of misery.
When I first started bike commuting, I was working the same place as my husband. I would drive in with my bike in the truck bed - then bike home - and he biked both ways. The next day, I would drive in with him, then we could drive home separately to recover the bike.
Now I'm biking both ways, and don't need a rest day inbetween. :)