1. About 2 years. But it could be a bit more if patrons decide to add more content (side events, new girls, new H-scenes...)
2. There's no rule about this. Usually it's about 3 months. This last one needed a bit more, but we're trying that the new one will be a bit shorter. Is not about speeding up, it's more about how much content an update has. More content needs more time and shorter updates have less. We're trying to reach a certain balance.
3. Dynae and Izuin are the main girls of the game. And we are not done with them :)