It makes very little difference. Google is aware that people abuse the system, just as they do with keywords.
Far more important is how often you actually update your content or add new content. New websites are being created at the rate of thousands a day (perhaps tens of thousands). The vast majority of them will be neglected by their owners very quickly so Google won't want to fill it's database up with sites that are unused, or neglected. One of the measures of this is how much new stuff there is on your site between visits, and how much change there has been between visits. Google can see this for itself very quickly, so if you don't create new stuff regularly, why should Google visit regularly?
Whatever you say you do (update daily, update weekly, update monthly, update never) Google knows what you actually do.
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