Dinah turned redder, and said, "Well, every minute it was happening last time, and then, during the Reserves meetings--" She nodded over to Arthur to give credit where it was due. "Some of the exercises we've done fit into that, especially ways off the Island and keeping exits open, and, well. It came up once in New Gotham, even though they weren't zombies, just hypnotized." She swallowed. "So, I don't know, several weeks, off and on?"