How do I adjust the video length in Live View

When I get a motion alert and open the video, the video recording stops too soon. So if I immediately open a new Live View, I still get the same behavior. In the app I have recordings set to 30 seconds, but what I'm experiencing is the video cutting off after maybe 10 seconds.This is a little bit of a problem, this morning I had a person trying to get into my home (when no one was there). I contacted the police, and they responded in under 10 minutes, but I was not able to keep a good view of the person while they were en route.I like the ability to cut off normal recordings at 30 seconds, but in a situation like this, I would like the ability to sort of keep an open ended live view going. Or at least minutes at a time instead of seconds...