I challenged the test on the 10th of October. The application was mailed on the 15th.
They claim to have received it on the 21st of October. They got to working on it and updated the status to processing around the 20th of November. I phoned in the next week and got a case number and had my reference phone in the same day (27th I think.)
I now have licence in hand (on December 5th)
I gave them 3 weeks from when I put it in the mail and then phoned weekly. I began to phone more than once a week when they indicated that they had received my application.