No personal experience, but friends were told by the TA it could take up to 6 months, not what you want to hear I'm sure. :(Although you may be luckier.
PS I would post this question in the XL flights thread and you may get a more positive reply.

Hi,
Snap, I also posted off a claim form to the CAA as well as to my credit card company as soon as the news broke. Not heard anything from the CAA but after a couple of phone calls to my credit card company I've been told I should have the refund by the middle of next week. I won't hold my breath though, I think it's something they just said to get me off their backs. Someone on the xl flights forum had a refund on her DEBIT card over a week ago.