Two hours. Watches are normally stood in four hour increments starting at 0000. If you have a three section rotation, everyone stands the same watches day after day. And someone has a real hard time getting dinner each day. So most ships 'dog the watch' and split the 1600 to 2000 watch into two parts, 1st Dog Watch is 1600 to 1800 and the second is 1800 to 2000.
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