Managing update frequency

I have Norton 360, updated to latest version. My issue is that I cannot find anywhere that I can set the definitions update frequency. I don't want to have definitions any later than 2 days. However, my computers don't seem to update on any schedule, only when I run LiveUpdate manually. I have had definitions as much as 2 weeks old and Norton didn't seem to feel there was a need to update.

I have to believe there is a setting somewhere I'm just not finding that will fix this. Thanks!