As far as I know it depends on the device and which timer you're using - it'll be in the kHz range I believe.
@Gordon started
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
As far as I know it depends on the device and which timer you're using - it'll be in the kHz range I believe.