A meeting’s start_url value is the URL a host or an alternative host can use to start a meeting. The expiration time for the start_url value is two hours for all regular users.
When does the 2 hour time start? From meeting creation? Or meeting start time?
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The “start_url” will expire 2 hours after the creation of the meeting. If you want to get an updated value for the expired “start_url” you can retrieve it by making a call to the Get a Meeting API .
You can not modify it to make it longer but you can retrieve a new one by calling Get a Meeting API.