Pump manufacturers list time intervals that they recommend components on a pump to be greased, inspected or replaced. A run time meter is usually mounted on the door (or inner panel if supplied) to display the total hours that the pump has run. This is useful for preventative maintenance means.   You will also be able to track how many hours per day, week or year the unit is operating to be able to schedule maintenance. A separate run time meter will be installed for each pump controller.