They run every 24 hours. If you want to run it manually, you need to hit "Update now" button in Awstats page and wait for a couple of hours.
edit: I just checked if there are any problems:
Code:
==> cPanel Log Daemon version 26.0
[2016-04-01 17:36:36 +0200] Logs are already being processed, please try again later.
As you can see, logs are generating by the server, It may take some time.