The Appeal Court ruled that as the charges against him were not as serious as others involved, and that he had entered an early guilty plea, the starting point for his sentencing should not have been more than two years.
It also reduced his home detention period for time already served in prison.
More than 25 staff have been convicted of drugs charges in relation to the chain of 16 stores, including owner Michael Quinlan and general manager Peter Bennett. Both Quinlan and Bennett are appealing against their sentences.