QUOTE (briv1016 @ Sep 20 2008, 10:06 PM)
What is the duration of the primary mission and what is the likelihood of an extended mission?
1 Earth year primary as I recall. Since this mission is the prime relay for a possible 2016 rover mission, the chances for an extension are probably excellent (although they could keep it going just for relay without collecting and analyzing the data, but so far, NASA hasn't done that kind of thing to my knowledge).