I dont truely remember but Herbtania (sp) says something like 7-10 days for a treatment, I was told to run it longer and did successfully run it for almost a month with good results - until the Ich subsided.
Whether it was the Herbtania or not - your guess is as good as mine but I have been right on track since that month.
During that time I increased my water changes & was heavily vacuuming the sand, due to the Ich eggs being in statis there, and I ran garlic soaked food (1 hr), increased the volume of food a bit.
Remember it takes time - patience. Easy for me to say though as I am not in your shoes right now.
Tank:
55g with a 15g sump, 1-1.5" sand. Also running a Coralife TurboTwist 9w UV - with low-med flow.
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