I would give it a full week or so.
I'm getting very very concerned

... It's now day 6 of CopperSafe... I believe I'm still seeing
new white spots on all the fish, and if not new, they are growing in size where they were not visible before. I double checked the copper levelers and if anything, its over 2.00PPM. I probably put in more than the recommended because spots kept coming and I was in doubt I had 2.00ppm cause the tests were hard to read. I've been using API test, and actually yestedray I checked with Salifert test and it also shows 2.00ppm.
All the fish are still eating except the regal, which stop eating around Thursday. The white spots are very small but a LOT, and very hard to see without viewing at an angle.
The expiration on my first CopperSafe bottle was 8/2017, not sure if that was a bad bottle. I did a 40% water change a few days ago and dosed using a new CopperSafe bottle that expires on 7/2018. I dosed the saltwater mix before putting it in the tank just to make sure the levels stayed that way. The water change was 18 gallons (suppose to dose with 4.5 teaspoons, but I gave it 5.5 teaspoons).
I have some CP shipping out today and I might get it on Thursday. When do I abandon CopperSafe and go with CP?
Basically, when should I not see new whitespots on the fish, and when should all the old whitespots disappear? The potters angel started scratching over the weekend and as of this morning, she's still scratching a lot. Should she be stop scratching now? How do I know CopperSafe is working?