Recommendation for frequency of NIS 2013 full scan?

I noticed that out of the box, NIS 2013 is set to run a full system scan every 30 days.  Although quick scans occur at least daily on my computer, 30 days for a full scan seems awfully infrequent.  Any recommendations for the frequency of the running of full scans?  Every 7 days; or even daily?  Thanks--