My Norton schedules a weekly update. You can go to the site to check for "urgent" updates at any time.

Anything "critical" will often be sent out as soon as it's available, and I've seen flurries of "special updates" daily for a few days when there's been a bit of activity by the crudmakers. On a couple of occasions I've received updates more than once per day - that I noticed. I can't say how often that may have happened when I wasn't at the machine.

John