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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.
@Gordon
Ahh - I see now you meant this specifically for
accellog.Yes, in that case I'd be tempted to use
file.getLength()/15(15 is a guess) to get a fast but 'good enough' length estimate.