Lifetime of Murata's supercapacitor(EDLC) depends on applied voltage and surrounding temperature.
For example, the following graphs are lifetime(hours) of DMF series by surrounding temperature. For other series, please contact your local Murata representative.
In addition, For your design, Murata has a simulation tool that can calculate Cap/ESR degradation and discharge performance at end of your set life in given condition. The simulation tool is available on "Supercapacitor site" of "my Murata".