Darmie is correct, you can scan around but there is a bug that the player doesn't play the final few seconds of the clip. It is recorded and if you go to the trouble of viewing on a computer the full event is recorded.
Also, my sentry seems to record 10min 49 seconds mostly before anything moves. The the player will play up to about 10 min 15 seconds or so and then just skip back to the beginning. It's not consistent but never plays the final few seconds.