So I've got a bunch of freeze-dried colonists traveling in torpor to a solar system 55 light years away at 92% c. From an outsider's perspective it takes them sixty years to get there, but how long would it feel like for the people onboard the ship? How long would they be in suspended animation, and how many countermeasures would need to be put in place to regenerate lost muscle and generally keep them from looking and feeling sixty years older once they reach their destination? 

I'm not sure of the actual numbers, so I thought I'd come looking for help here :)