It seems as if, the last set of data represented in many Google Analytics accounts comes from early Friday morning, and no later. I checked my Google Analytics accounts and I have seen the same thing. Since it's launch, Analytics has been plagued with issues since its start, including these stories;
- Google Analytics Having Issues: Reports Not Displayed - Google Analytics Closes Doors to New Users - Google Analytics & AdWords Data Inaccurate - Urchin Server Side Compared to Google Analytics
Forum discussion at Search Engine Roundtable Forums.