fast forward time with ctrl alt shift and if you are a healer build you can remove all their injuries with mend wound with the second perk for it and they will move even faster
if you rescue them you can talk to the guild guy and he gives you moralirty + experience and if they weren't moots also money potentually a lot of money if you rescue a lot of them
Here's a video of me redeeming my hostage rewards just note that I play in a sweaty minmaxxy way that most people won't do.