You slipped in while I was typing:o)
It will take quite a while to dry out completely. It's been going on for so long that the masonry will be saturated. If you do go for knocking off, then have it done as soon as possible to let the wall dry out naturally. As Jack says, I can't be specific, keeping an eye on the colour of the masonry will give a good indication as to how it's going.
Could you post a couple of pics?......... with maybe a close-up?
Post them on my FB wall?