I can do you one better - it's exactly 6 hours, 12 minutes and 49.62 seconds.

192,000 * (2^32 - 1) = 22369.62133 (seconds)

That is exactly 6:12:49.62 worth of time.

On Wed, Dec 7, 2016 at 3:18 AM John Rigg <j@jrigg.co.uk> wrote:

On Tue, Dec 06, 2016 at 07:03:04PM +0000, Thomas Howe wrote:
> It does seem to be consistently 6 hours and 13 minutes before the process
> spike, even when the sample rate is changed from 96 kHz to 192 kHz.

At 192kHz the JACK frame counter (32 bit uint) overflows and rolls over
to zero after approximately 6hr 12min 49.6s. Coincidence?

John
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