Example of one of our large digital LED timers DC-40T-UP-TERM that is controlled by our diffused reflective sensor. The sensor maintains a PNP output to the timer as long as an object is detected. Once the object has passed the PNP output is removed and the timer stops. the timer will accumulate the time count until it is reset either remotely or locally. See Similar products at DC-Digital.com
See video using DC-40T-UP Maintained run sensor.