From Facebook Developer Wiki

Does this change per day, per 12 hours, etc.?

It's my understanding that it is reset every day at 1am PST... can anyone confirm??

Is there a way to get this information for announcement notifications? 26716424

Good point. I'll add this oversight in now, but you can pass announcement_notifications_per_week to this method. -- Pete (User:563683308)

Has this page been reset to a template?

Someone vandalized it over the weekend. It's been fixed. Thanks, Pete (563683308 12:11, 13 July 2009 (PDT))