Reclaim also gets if'y after about two weeks. Not to say it will not work after a month, but it's not as reliable. Non combatants are not as religious about scanning as the rest of us.
I can think of a few that didn't scan but once every month or so, and ended up getting cornered by the Kyr'ozch. Need less to say they could afford it, they just didn't think they'd need it where they were living. One lesson that can't be learned 'till it's too late.