Front end the miles. Do the long way to work and then if you bag it coming home, at least you had a long ride once that day. You actually have a more ideal situation imo because now if the weather really sucks for the ride home, you have a viable option to get home fast. When I worked away from home it was a 25km round trip but I could & did extend it often. It was nice to know that when it was pouring out I could zip home relatively quickly.