Does adsense calculate what you have earned over the weekend? In other words, the clicks that you get saturday or sunday, will they show up the same day? is there a time lag?
I have noticed "LAG" during many times not just weekends, but think about it they server billions of ads and billions of publishers so i guess it is to be expected. Usually i think your adsense account updates every 45min (that is just my guestimate)
To me personally it seemed pretty quick, very little lag. I didn't notice any 45 minute lag behind. Again though however, I was only serving about 20 ads on my entire site, so I'm sure it could be different for larger sites, and hence more ads to struggle with.
I have noticed about 30 minutes lag sometimes. But you can defiantly see the amount that you earned in the same day whether it was Saturday or Sunday.
I think the stats are updated in the adsense account as soon as possible and I have read somewhere that they are updated on a real time basis and if at all there is any lapse, it won't take much time to show in the update.