I think it’s about normal for private lessons – plus you’re getting work to do in between lessons. Anyway, it’s just an option.
Just an update… here, in Crete, it’s possible to find lessons much cheaper – that is true – I’m paying 12 euros (cash only!) an hour for private lessons. However, if FredandJulie are in the UK and don’t have ready access to a Greek teacher, then the Skype is worth considering – you get to hear Greek spoken, you can have a conversation, you can ask questions – just as you would face to face.