Settings - Download Timeout

The 'Download Timeout' defines the maximum number of seconds between consecutive partial download requests that are counted towards the same download job.
If the browser downloaded a single file using more than one HTTP request, the log file will contain a log record for each of the submitted requests. Therefore the average URL processing time might be less than the overall file download time, shown in the top downloads report.
This option is only available if the Stone Steps version of the Webalizer is used.