Hand moving the 3D object if no interaction

Hi,

I’d like to create an automatic animation effect for my scene. My goal is to make a 3D object rotate on its own only when there has been no user interaction (mouse movement, click, touch, etc.) for a certain period of time (for example, 5 seconds).

This effect is similar to what can be seen in Google Model Viewer, where a small hand appears to indicate that the object can be manipulated.

I’ve thought about using logic based on an inactivity counter with puzzles, but I’m not sure of the best way to link interaction events (mouse movement, clicks) to the resetting of this counter.

Does anyone have any advice or an example of puzzles to implement this behavior?

Thank you in advance for your help!