Inviting temporary participants to a virtual meeting or other communication session for a fixed duration

A method comprising:

• receiving a session invitation from a first communicator for a first communication session, wherein said session invitation is for a temporary participant to join a sub-session of the first communication session for a sub-session duration specified by the first communicator, said sub-session duration being less than a duration of the first communication session;
• conveying the session information within a session invitation to the temporary participant, so the temporary participant is able to accept or deny the session invitation with knowledge of the sub-session duration;
• receiving an invitation response from the temporary participant that indicates the temporary participant has elected to join the first communication for the sub-session duration;
• responsive to the invitation response and at a time that the sub-session is to start, joining the temporary participant to the first communication session;
• providing sub-session duration information to at least the first communicator and the temporary participant so that a count-down for the sub-session duration is able to be presented upon user interfaces of the first communicator and the temporary participant;
• determining at time at which the sub-session duration has ended;
• and
• responsive to determining that the sub-session duration has ended, automatically removing the temporary participant from the first communication session.