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Roller Derby Jams are what the periods of a bout are split into.
So in a Bout you have 2 periods, each are 30 minutes long.
During the periods, you have what we call Jams, which last either 2 minutes or until the Lead Jammer ends the Jam by "calling it off".
Since not every jam is 2 minutes there is no specified number of jams in one period.
hope this helps. =)
What else can I help you with?
When was Stockholm Roller Derby created?
Stockholm Roller Derby was created in 2007.
When was Roller Derby Brasil created?
Roller Derby Brasil was created in 2011.
When was Roller Derby France created?
Roller Derby France was created in 2011.
When was Maine Roller Derby created?
Maine Roller Derby was created in 2006.
When was Montreal Roller Derby created?
Montreal Roller Derby was created in 2006.
When was Copenhagen Roller Derby created?
Copenhagen Roller Derby was created in 2009.
When was Helsinki Roller Derby created?
Helsinki Roller Derby was created in 2009.
When was Houston Roller Derby created?
Houston Roller Derby was created in 2005.
When was Pacific Roller Derby created?
Pacific Roller Derby was created in 2008.
When was Toronto Roller Derby created?
Toronto Roller Derby was created in 2006.
When was Humboldt Roller Derby created?
Humboldt Roller Derby was created in 2007.
When was Wasatch Roller Derby created?
Wasatch Roller Derby was created in 2008.
