The Jargon File (version 4.4.7, 29 Dec 2003):

nanofortnight
 n.

    [Adelaide University] 1 fortnight ? 10^-9, or about 1.2 msec. This unit was
    used largely by students doing undergraduate practicals. See 
    microfortnight, attoparsec, and micro-.


The Free On-line Dictionary of Computing (30 December 2018):

nanofortnight

    (Adelaide University) 10^-9 fortnights or about 1.2
   milliseconds.  This unit was used largely by students doing
   undergraduate practicals.

   See microfortnight, attoparsec, and micro-.

   (1996-11-15)