Well if you are in a que waiting for DSLAM to be installed in the area, even then you are lucky. Moving end of Dec. and they don't even have a planned rollout for ADSL in the area.
I think you can count on a waiting period of anything between 7 days to 7 months from the day your application got approved. There is no real standard for activation/installation times. You could get lucky and the techie phones you the day before out of the blue and the next day you have it, or they could schedule an appointment, confirm and not pitch up at all. It's a roll of a dice I'm afraid.
PS: Just keep on them, phone them, go to the Telkom shop, just keep them hot. If you don't well they tend to loose application forms quite often.