microfortnight

from Jargon File (4.4.4, 14 Aug 2003)
microfortnight
 n.

   1/1000000 of the fundamental unit of time in the
   Furlong/Firkin/Fortnight system of measurement; 1.2096 sec. (A furlong
   is 1/8th of a mile; a firkin is 9 imperial gallons; the mass unit of
   the system is taken to be a firkin of water). The VMS operating system
   has a lot of tuning parameters that you can set with the SYSGEN
   utility, and one of these is TIMEPROMPTWAIT, the time the system will
   wait for an operator to set the correct date and time at boot if it
   realizes that the current value is bogus. This time is specified in
   microfortnights!

   Multiple uses of the millifortnight (about 20 minutes) and
   {nanofortnight} have also been reported.
    
from The Free On-line Dictionary of Computing (8 July 2008)
microfortnight

   One millionth of the fundamental unit of time in the
   Furlong/Firkin/Fortnight system of measurement; 1.2096 sec.
   (A furlong is 1/8th of a mile; a firkin is 1/4th of a barrel;
   the mass unit of the system is taken to be a firkin of water).

   The VMS operating system has a lot of tuning parameters that
   you can set with the SYSGEN utility, and one of these is
   TIMEPROMPTWAIT, the time the system will wait for an operator
   to set the correct date and time at boot if it realises that
   the current value is bogus.  This time is specified in
   microfortnights!

   Multiple uses of the millifortnight (about 20 minutes) and
   {nanofortnight} have also been reported.
    

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