i can not make a prediction, since we have not found any habitable planets we could send them to. then we would have to solve the problems of who is going to raise the seedlings once they come out of the incubators, and how you are going to feed them. In essence, you can only start growing them once the ship has arrived at the planet, and they have to be raised on the surface of a probably inhospitable planet.Which means you need androids with Artificial Intelligence, as well as enough raw materials to start an initial colony.