KTRboston was right: for Honshu the radius in km is 100 which delivers
about 54nm. I recommend a circle with 50nm which you should not leave. The time for Honshu is 2880 minutes which is 48 hours or 2 days.
If you leave the zone the timer will start new (i think).
Only Sulu has smaler radius with 75km. All other patrols have 100km or larger.
You can check this by our own:
..sh4\Data\Campaigns\Campaign\PatrolObjectives\fil ename=Patrol_AreaX.mis
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