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Time dependence of the magnetic susceptibility of two kinds of Al-Pd-Mn icosahedral quasicrystals was studied to investigate the phason relaxation in the anneal after water quench. Al 70 Pd 21.5 Mn 8.5 remained in the f-type structure and Al 71 Pd 21 Mn 8 transformed to p-type. A universal time dependence was found in the initial decrease in the susceptibility characterized by square root of time. The whole time dependence fits quite well to a function representing phason relaxation predicted by Toner.