Adding compulsory time to every meeting

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What's the best way to add a mandatory 1/2 hour of time at the end of every
meeting requested, to allow for cleanup of rooms etc.

 

[Brian Tillman]

What's the best way to add a mandatory 1/2 hour of time at the end of
every meeting requested, to allow for cleanup of rooms etc.

Extend the end time of the meeting by one-half hour.