How much penalty time must Jammers serve when both sit in the Penalty Box simultaneously?

In roller derby, when both Jammers from opposing teams are sent to the Penalty Box at the same time, they do not serve any penalty time. Instead, this scenario is often referred to as a "jam" where both Jammers are in the Penalty Box, allowing the remaining players on the track to control the flow of the game without the influence of either team's scoring player.

The concept of the Jammers not serving penalty time together is rooted in the structure of the game, which enables a strategy called "jam-ending" where teams can leverage their numerical advantage on the track. The absence of both Jammers means that no points can be scored during that particular jam, and the game continues with the blockers until one of the Jammers is released from the Penalty Box and can rejoin the play.

This rule differs from situations where players of other positions might have to serve time concurrently, ensuring that the dynamic of the game remains balanced and strategic without allowing scoring opportunities when both Jammers are penalized simultaneously.