At one point I was in the US while she was in Europe, but on average we spent about 4 to 8 hours away from one another depending upon where work was...but neither of us is the type to need to travel to see each other every few days like some of our friends.
It's a personality quirk...we're both introverts by nature, so it doesn't bother us to spend a lot of time alone. I remember I used to just come home from work, make dinner and she'd call me and we'd get on Skype and play computer games.
Dating another nerd = easy