But how often should a stats program count a unique hit?
Like, I got this from a sites FAQ
When you are browsing a site, every time you follow a link to a new web page, it is treated as a single page view . Site Meter defines a visit as a series of page views by one person with no more than 30 minutes in between page views. If you click on a link to another site, and then come back to your site within 30 minutes, you are still on the same visit and Site Meter won't increment the counter. But Site Meter will increment the number of page views recorded for your current visit.
So if you visit the site then come back after half hour it's two different unique visits, isn't that too little? I thought the norm was every 24 hours?