How many times does AdSense update daily?

I'd like to know how many times Google AdSense updates their stats daily, or if it is even done daily? Does AdSense update at certain times for everyone, certain times for you, your no. of pageviews / clicks, their total no. of pageviews / clicks.

There could be alot of ways they do it, i'd just like to know how.
Do bigger sites get updates more frequently than smaller ones?

Thanks, maybe someone knows.