There is no problem, but you'll have to meet her at least once a month or otherwise, one of you will get tired because of a long-distance relationship! I'm not disappointing you, but I dated a girl in my country then later she traveled to Turkey for studies (4 years), when she came back home she was having a child with another man already! But I didn't blame her, a woman needs a lot of care (like a little baby), so if you will be far away from her for a long time she will miss you and she will be tired of waiting!