This read-create TimeInterval object sets how long the system must wait before sending another identical threshold notification if the monitored radio signal keeps oscillating around the threshold value. It exists specifically to prevent notification flooding when a borderline signal repeatedly crosses back and forth over a limit. For example, if received power hovers right at a configured threshold and keeps triggering repeatedly, increasing p2mpThreshHysteresisTime would reduce the number of duplicate alerts an admin receives during that instability.