How Long is Too Long to Be on Accutane?

I've been on Accutane for 15 months now, I began on a dose of 40mg a day, my dermatologist then reduced my intake to 20mg a day the last 3 months. He now has told me he will ween me off the drug and I should take 20mg each day for 5 days of the week and then I will progress to taking 20mg 3 days a week, I was told this last stage should take approximately 3 months and then I should be off it. Is this normal to be on it for so long? I'm experiencing blushing.

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