Concluding A Jam

A jam will be considered at an end for any of the following reasons
the expiration of the 60 second time limit
at the conclusion of each 10 minute skating period
when the lead jammer places both hands on his or her hips a jam may also be called by the officials for any emergency.
A jammer receives one point for every member of the opposing team he or she passes, every time he or she laps the field within 60 seconds.