Hi Ferguson14,
I got back a few weeks ago and between assesment day and the course start date for me was approximately 8 weeks, but that was over the christmas period as well where everything shuts down for about 2 weeks. I heard that they were struggling to get numbers for the FSP courses and out of our group I think we all had 2 weeks notice so make sure you're available. Of course it's also dependant on how well you have performed up until this point as selection for FSP is competitive (I wasn't really aware of that until later.)
I also heard that the distribution pool is quite low at the moment, again not sure how reliable that is but one of the guys on the BFTS course told us.
Good Luck!