See prior thread from Movie Board where AntiBody addressed this.
https://www.hsx.com/forum/forum.php?id=3&pid=599907
So my understanding of the that thread: If it goes wide in the next 11 weeks(within the 12 week Limited period) without losing any theaters before going wide the OW will use that wide Weekend gross. Once it loses any theater count (even if it gains some initially) it will delist that Monday at $0.00