I want to know how often are the stats on are51 page of judaism.stackexchange are updated. I have a feeling that the numbers about questions per day are not correct.
The progress/stats pages on Area 51 are updated hourly.
Something to note, though: the progress is averaged over a period of time (that's how we can get fractions of questions). So, while I don't know the exact details of the algorithms, it could be earlier days are "pulling" it down.