Ever since installing Symantec Endpoint Protection in unmanaged mode LiveUpdate has been annoying me by updating itself once per day... that's not the annoyance, though. The annoyance is it creates a window on screen showing progress, and then requires user intervention to make it go away!
I was just starting on my quest to find a way to change that behavior
when I found someone had already done the homework. Far be it from me
to be ungrateful and not use the results of his efforts (command-line
used below). 
$ sudo symsched -d all
$ sudo symsched LiveUpdate "Update All Daily" 1 0 -daily 03:13 "All Products" -quiet
Oh, and the references he lists are here, there, and the other place in case his blog goes bye-bye.