tedster - 4:31 pm on Mar 30, 2011 (gmt 0)
A page with a 2 minute time-on-page is a positive signal. IMO, that's not a problem like a nearly instantaneous click-back would be. A "shallow" content page (Panda's target) would not keep visitors engaged for two minutes.
Did these pages lose search traffic for you after Panda, or are you concerned for the future?