Verifying Scheduled Scans

I have just purchased Avast 4.8 pro and set a scheduled scan to occur at 3am. There is no evidence in any log file or event viewer that this has occurred. How do I know that it has run?

Page 41 - 43 in user guide http://www.avast.com/eng/download-user-guides-and-manual.html

Did you set a report file?
Did you check avast log viewer? Is there anything detected?
In avast Pro, check the “Sessions” folder.