The "Statistics by day and General statistics sections contain the overall campaign statistics by default. Check the Detailed ad statistics box to view more detailed information.
The ad system will then calculate the approximate volume of statistical data required. If the requested amount of data is quite large, it may take a long time to process or cause your browser to crash. This is when a warning will appear. Advertisers can then choose whether they want to receive the statistics in an XLS file, or view them in the browser.
It's recommended that you download the file. This process can take between 15 minutes to an hour to generate the XLS report. Once complete, you'll be able to view it at your convenience. You may see the ready report in the XLS Statistics section on the statistics page, where it will remain available for two weeks.