[@Deserted] Well, that definitely depends on how we conclude this roleplay, and also how the crew is divided. The negotiation Benji had with the Principality is that he will make contact with the Velbenan with the intent of hunting her down, and in return the rest of the crew will be escorted to a planet sustainable enough for them to rebuild their race. Also, the Principality will provide the supplies and security they need to do so safely. Of course, now that plan has been slightly adjusted with Tahlia now joining Benji. 

So, the amount of time could mainly be determined by how far you would like to have this new colony progress. I would like to have it too far in time with the crew now a bunch of elders, but perhaps with at least one of the girls expecting a child. It makes sense especially if there is any hope to repopulate. Although there aren't enough current humans for there to be diversity within genes, so cloning with the aid of the Principality could help instead. But if that is the road those within the colony wish to take, the Principality will most likely not resort to that until Benji and Tahlia are successful in their mission.