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does anyone know how big the objective counters for 5 edition have to be?

In the 5th edition standard missions, objectives are just a point on the table.

You can build or use objective markers to mark this location, put the point is still the actual objective.

Obviously if you build a marker that makes it difficult or impossible to get models within 3" of the actual center point you'd need to come up with a work-around with your opponent (like measuring from the edge of the marker).