As both a coach and someone who has served as a judge at many tournaments over the years I would like to second what Sonya said. While I can tell you that if a team is clearly at the end of their presentation/skit when the 5 minutes is up, the judges will often let the kids wrap up, this is not guaranteed. If it is unclear that they are at the end or they are running over by a significant amount, then they are generally stopped so that they can proceed to the Q&A portion. As Sonya said, some judges will stop a team right at 5 minutes. The judges - like all of the volunteers you will encounter at FLL tournaments - work very hard to give the kids the best experience that they can. Trust me, they don't want to have to stop a team because it can be very unsettling for the kids!
The Q&A portion is critical for the judges to gather information that may not have been clear in the presentation in order to most fairly evaluate a team's project in relation to the others. There is generally very limited time available to judges to complete their evaluations between judging sessions at the tournament, so it is in the best interest of every team to not compress that time any further by knowingly running over.
Good luck to your team and all teams participating in the upcoming tournaments!
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