Well, there are a lot of factors to consider. You could argue that semi-open alpha's length spanned some 5-6 months if I can remember, and then further argue that semi-open beta's length would be somewhat comparable, but personally I feel like semi-open alpha could've been open alpha after a certain period of time. The servers, in my opinion, didn't have a huge load to bear with alpha having less content overall and having less players trying to get in. Now we enter beta, though, and with more content and more players wanting to play, I think there could be a sort of a setback on the progress of making the game open to everyone, which is necessary. So I think another few months, maybe 3-4, is realistic.