It will keep doing it for a while. Even a month or so after it's all settled, once you stir up the sand there will still be a little cloud that'll be there for a few hours. My friends cleared up in 3 days, mine was about 2 but then I would stir it a bit just to get some cloudiness out of the way for later cleanings if I ever wanted to stir up the sand. I did'nt want to bother any of my inhabitants with another sand storm.
-Jay