Airmeet is always conservative on data use. The actual data consumption in each session will vary based on several factors, such as participants with video unmuted, session layout, stream viewing mode.
If there are 4 speakers in a grid layout sending simultaneous video, data consumption in the different modes will be -
High Definition mode - 0.9 GB / hour
Standard Definition mode (default) - 0.585 GB / hour
Low Definition mode - 0.18 GB / hour
Audio Only - 0.09 GB / hour
Lite Mode - upto 0.75 GB / hour