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One month if that low dose it's unlikely. Some people are particularly sensitive to prednisone but mostly peor dont get side effects from a dose that low and that short.
My kid only gets moon face if her dose is 20 mg or higher. When she gets it moon face doesn't go away until she is completely off for 3-4 weeks. Right now she is on a taper(ish) at 10 mg and her moon face is sticking around. Why are you going to a low dose of pred?