Depends, what ship you talking about...
IMO, LibDrd has les crew and population capacity, than KuBS and RMBS. Exact number, Im not sure about thousands, if we check for a sizes... I say LibDrd from 70-120 crew need. BMBS around 200. ZonerDrd, well, he could be around 1000, it's kinda colony ship.
Also, keep in mind, that ship in ~3000 year can has some automated systems, and less ppl would need to operate it.