I have Ubuntu 20.04 LTS and I would love to install a sort of screensaver or timer in order to impose periods of relax for my eyes. It should show a screensaver every period of time for 10 minutes.
For instance, if I start the system at 9:00, the app should impose a screensaver at 9:50 (every 50 minutes) and keep it for 10 minutes. Then rinse and repeat the routine at 10:50 etc. You get the idea. Is there any app to accomplish this task? I checked several "screensavers" but they are based on the concept of inactivity and lack this cyclic functionality. Thanks in advance for suggestions.