I have personally never had them get back to me within 24 hours, I actually assumed it was precisely to stop me from cancelling with a full refund and booking elsewhere if it was still the same price elsewhere. Recently there have been a few reports of people actually getting a response within 24 hours and therefore being able to cancel when it didn't go their way. Here is one tech example from this morning: https://www.flyertalk.com/forum/brit...ntee-fail.html