Hypo Question

One of my friends tanks has developed Ich. We decided to go with hypo as many people do. The temp is at 80 and the SG is at 1.009. It has been that way for almost 2 days, I was wondering how long should it take for all the dots to disapear, so far many of the fish look much better however the flame angel still has some. I plan to keep it at 1.009 for 3 weeks after the last dot goes away but I was just curious about how long I should wait to see them disapear.
 
ok cool the I guess I shouldnt worry yet. I cant afford a refractometer so its at as close to 1.009 as I can get it. I have read conflicting things about the level, all the way from 1.014 to 1.008. I immagine temp will change the SG so I hope this is ok.
 
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