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An equation for the retardation time for enthalpy recovery has been tested for polystyrene as a function of heating rate, temperature, and initial displacement. The temperature dependence ϑ and displacement dependence ξ of the retardation time are determined from the data assuming a single relaxation time. The fraction of the temperature dependence of the retardation time due to structure (1-X) and due purely to temperature (X) are calculated and compared with results for other polymers. Some factors which can affect X are discussed.