How can I have correct data for join/leave time of attendees?

In fact, the breakout rooms may be the reason for the inaccurate timings as they are treated as separate sessions within the main session.
To get correct data for the participants and their joining / leaving time, you can try the following steps:

1. tell participants to leave the session only when they actually leave the main session. For example, if they are in a breakout room, they should not leave the session, but instead leave the breakout room when they are done.
2. Verify that your GoToMeeting application is updated to the latest version. An outdated application may not function properly.
3. Use GoToMeeting's reporting feature to get detailed information about sessions and attendees. You can generate reports that show you information such as the exact attendance time, total duration, and number of attendees.