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How many hours is benzoyl peroxide effective

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I was wondering that too a month or so ago.

Dan told me that studies have shown it to last for upto 12 hours.

which is why 2 applications a day(morning and evening) is usually very effective, because you get 24 hour coverage(more or less)

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Actually, the study I quoted shows bp lasting 24 hours. There are still an extremely low level of P.Acnes at the 24 hour point. However, through trial and error, this does not translate to clear skin. Twice daily works best for that. Why? Perhaps it is the mild drying and peeling effect of bp, but no one knows.

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