Circadian cycles are 24 hour.

Sperm production, and the hormones that regulate it, is on an
approximate 72 day cycle. This was elucidated when looking at the
development of a male birth control pill.

Garnet

On Sun, 2004-08-01 at 05:46, Ode Coyote wrote:
>  Is that the cikadian or circadian [or something that sounds like that] cycle?
> 
> ode
> 
> 
> >At 06:15 AM 29/07/04, you wrote:
> >>BTW you guys have a 72 day cycle, not unlike the female cycle, just
> >>longer. 
> 
> 
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