How much for visa for my girlfriend coming from ghana?and how long?

First can I say you are being conned? There is no real girlfriend there, unless you actually meet her in person. Ghana is of course the leading nation for dating fraud. In most cases they have rooms full of girls sometime old women, using the same ID of a young girl that they got.

Total passport and visa is not over 300 dollars

So tell me, how did you meet ?