Try to lower your Frame Rate to a lower number. I use 6 fps and I get over a 5 minute video if motion is continually detected. Go to Tools, select Preferences. Got to Video Settings and slide the scale to a lower number. I'm assuming you are using AHP with iWatch/aka iWitness. Also, make sure your motion sensor or whatever triggers the cameras allow for this extended recording. When your motion sensor sends an off signal to your cameras, recording will stop.
