PHP: How to make "Latest visit" count nicer

I have "Your latest 5 visits" at the home page of the user when he logs on. It works great without any problem.

But then i want to change it. I dont know how i should do this, but someway somehow only count the user 1 time at the time, and not e.g 10 times if he visits/refresh your profile.

So should i do this with a time checker? And for how long should it only count 1? When should second count? I need some idea for this, as I dont know if i should make it count 1 time per 10 minutes or 1 time per 1 minute..

So a good solution/giving开发者_StackOverflow a good realistic minute tip will answer the question.

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There are a number of tutorials about 'Your Last Visit'

http://www.tizag.com/phpT/phpcookies.php