BA services for me are taking 1 to 3 days, but there are occasional outliers, after a week I'd call up.
From a quick check of my CX transactions, the LHR and HKG originating services have credited about 3 days after. However some of those from mainland China. MNL, TPE and RGN have taken up to 3 weeks, crediting on a Wednesday, in line with the manual process used by some QR/UL/S7 services.
However while I was dipping down into my list, I did notice this, I had no idea these were taking so long.