How can I estimate the traffic volume of a meeting?

The amount of data used by a meeting depends on how meeting participants use the app.
The following use cases come from our experience so far:

One hour meeing - Participants use only handwritten text.
The traffic volume estimate is 2 to 3 MB for each participant.

One hour meeting - Participants use photos and sketching in addition to handwritten text
The estimate is 2 to 30MB for each participant.

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