How long after you add salt before your SWG will tell you an accurate level?

I have the Mineral Springs MS-22 by Bioguard.

It says to add about 215lbs of salt and I have added 180lbs so far and it still says 2600 on the display of the SWG. I have been leaving my pump on high running 24 hours. It has only beeen running about 12 hours since addding the salt. I didn't want to over add the salt as I heard the only way to lower is to drain.

My water is also now cloudy. I looked and I am not seeing any salt at the bottom but the water is cloudy. How long before it will clear up too ??