Minimal working vibration time on all Android devices

I'm developing a game, I do offer an optional setting with periodic vibrations for a specific game mode. To make this work well, I need a very short vibration. On my device, 20ms vibration duration works very well but on other devices, it appears to don't vibrate at all, while 50ms works but is too long for my preference. My guess is that some devices have a specific minimum time. So my question: What is the lowest vibration duration which will work on every device?