I'd like to point out the futility of the 2 meter in a room which has the air capacity of XX cubic meters and no proper ventilation. The air is not circulated to the extent that at least 70% or air particles are changed in a reasonable time frame (5-10 mins, but guessing). Meaning that a lot of particles of dust, virus, whatever will linger in the air for more than 15m potentially.
So essentially you are breathing in whatever others -regardless of how far they are!- have been breathing out.
- don't forget that every so often, apart from 1 person, the people change in the room adding their own used air to the mix.
So this 2m is at best window dressing and useless, at worst dangerous misconception that can/will/has lead to infection.