For example, Consider MO32 Power Contactor. The rated AC-4 current of MO32 is 32A.

The Electrical life of MO 32 at 32A AC-4 is 50000. When a 32A contactor is used for 32A AC-4 application, one gets an operation life of 50000 operating cycles. If the contactor does approximately 500 switching cycles per week then the contactor will last for a period of 50000/500 = 100 weeks i.e. roughly 2 Years.

Below is the selection table of contractors for 200000 operating cycles

For example, if one wants 200000 operating cycles for the rated current of 9A  AC-4 then contactor selected should be MO 25.