Hi Canada
An audit does not mean there is anything wrong with your claim. There are a number of claims that are audited as an internal process to check the process is being carried out correctly. You are just one of the people who has been chosen. I can't tell you how long it will take, but if you haven't heard by the first week in January - phone again just to remind them that your claim is due to run out in February.
BIS
Nothing on this board constitutes legal advice - always consult a professional about specific problems