alekaras, for me the footage is automatically split into 3.6GB chunks which equates to approx 4m40s each.
What are you trying to achieve? You can effectively pause the video simply by turning the record button off and on again.
If you want to include a visible pause in your final output, the easiest way to do that is to split the video where you want the pause (use the Clip command in Quicktime Player if you have it). Then export a still frame of the "pause" view and open it in Photoshop's Motion timeline. Drag the timeline to the required duration and render out of Photoshop in the required format and frame rate. This clip can then be dropped onto your Quicktime Player window at the point where you previously split your footage.
Plenty of other ways in other editing apps.