On Fri, 14 Apr 2017 16:30:48 -0000 (UTC)
Frank Miles  wrote:

> I have an embedded application for the RPi-3.  Unfortunately it's likely
> that uses will remove power without properly shutting the RPi down.
> Therefore I've got a 'power-going-down' bit of hardware which sets a GPIO
> bit causing a proper shutdown.  The question, of course, is how long does
> a shutdown take?

 It depends - mostly on how fast the SD card is, how many dirty
buffers need to be flushed and how long processes take to die. Best bet is
to measure it under your worst case loads with the card you intend to use
and add a healthy safety factor.

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