Flight options leaving Ushuaia from an Antarctica cruise

[k-b862]

Hello,

I was wondering if anyone knew approximately when Antarctic cruise ships dock back in Ushuaia? I am leaving on a cruise in Jan 2013 and am looking into flights. My flights to Ushuaia are booked, but not the return portion. There is a flight leaving at 9:10 am from Ushuaia to Buenos Aires that I would ideally prefer to be on. Do you think I will have enough time to get from the ship to the airport to catch this flight? Is there customs? how long does it take to debark. In your experiences, do the cruise ships dock early enough to make the connection? Thanks for your help.