Hi,Have you defragged your hard disk recently. If not then it would be worth doing that. If there is a lot of disk activity because your hard disk needs defragging or you are low on free space then you can encounter skips in audio and video recording. Also try to make sure you don't have any other applications running in the background while you are recording.
When it comes to setting the Project length, make sure you hit Enter / Return once you input the figures so thay are set. If you don't they will reset back to the previous settings.