Polycom Collaboration Server (RMX) 1500 Deployment Manual page 110

RealPresence Collaboration Server (RMX) 1500/2000/4000 Deployment Guide for Maximum Security Environments
A conference's Duration can be extended or shortened while it is running, by modifying its
scheduled End Time.
To extend or shorten a conference manually:
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2
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In the Conference List pane, double-click the conference Name.
In the General tab, modify the End Time fields and click OK.
The End Time is changed and the Duration field is updated.
Polycom, Inc.