I use the free loggging tool "AdLogger", which is very good. As it registers all clicks in real time and you can watch all the details of the clicks your page gets. Today I found out that there is 2 hours delay on Googles own reporting. You see, I have a channel that gets clicks very rarely and today Googles report told that there is a click. So I went straigth away to see when I really got that click and I found out that it was twwo hours before Google reported about it. I found out too that actually I got five clikcs from same IP, but Google reported only one - maybe because all five clicks came in minute and half and from same IP.
Is the adloger allowed in googles TOS ? Well 2 hours? One day I saw a delay of 5hours..depends on google's speed, by the way I saw many times that google changes the CPC of an ad, for example at morning it was 0.50$ but at night it changed to 10$, it's strange... and ads with 0.05$ < are usually deleted from my account with one day delay..this is strange too.. This is Google, get used to it..