When you get the mission, you also get a defined area to stay in, and a time to stay there. Word is that if you leave that 'zone' clock resets.
For example I have gotten: Go to within 150 NM of <zone> and stay for 96 hours. Also have had 100 nm, 72 hours. Sometimes message says to patrol, other times it says to sink ships.
Go back through your messages and look for the one that you received for this mission.
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