We don't currently have a maximum number of participants/limitation on the number of users on Tandem at a time in general (being present online, or split in many smaller conversations/rooms). 

In terms of large calls, like standup or all-hands, we don't have an exact number of how many people can reliably join a single call, as it's dependent on so many factors, including each user's computing capabilities and internet quality. While we are actively working on enabling a reliable way to host large calls, at the moment Tandem is best for smaller conversations in rooms (think of them like breakout rooms). For large calls (20-50+ people), we recommend most people mute and disable video (for example, people who aren't the main speakers). 

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