Micro break won't be triggered if the break duration is too small

[popyoung]

I set the break duration for micro break to 20 seconds, trying 20-20-20. But if I stare at the screen for over 20 seconds without moving my mouse or just talk to someone for a while, the timer resets. And I find it's hard to trigger this micro break. How can I prevent this? Or maybe it needs another setting like 'reset duration' or 'need auto reset'.