What is this kind of timer called?

Question

Years ago I worked at a farm that had an outside light on an adjustable timer. You turned a dial to set the desired period required for the light to remain on. On leaving the building the switch was pressed and the light came on and remained on for 30 seconds to 30 minutes, as set. I would like to install one as there is too much wildlife for a motion sensor activated light.

Answer 1

You're probably looking for either a spring-wound timer:

or a (digital) countdown timer:

As @Harper mentioned, you can get them in various time ranges.

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