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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 Maine Roller Derby created?
Maine Roller Derby was created in 2006.
When was Copenhagen Roller Derby created?
Copenhagen Roller Derby was created in 2009.
When was Montreal Roller Derby created?
Montreal Roller Derby was created in 2006.
When was Memphis Roller Derby created?
Memphis Roller Derby was created in 2006.
When was Providence Roller Derby created?
Providence Roller Derby was created in 2004.
When was Greensboro Roller Derby created?
Greensboro Roller Derby was created in 2010.
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 Roller Derby Germany created?
Roller Derby Germany was created in 2011.
When was Helsinki Roller Derby created?
Helsinki Roller Derby was created in 2009.
When was Tucson Roller Derby created?
Tucson Roller Derby was created in 2003.
