How much Internet Data does a 30 minutes game uses?

I just moved out and I have a sort of restricted internet connexion, I would like to know how much data a single 30 minutes game consumes to avoid burning my internet access in a single game.

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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