I measured a real EB at 13 gallons (total), 3 gallons of which is the reservoir, and 10 gallons is for potting mix. Since the EB accomodates 2 plants, that comes out to 5 gallons of mix per plant. So, assuming your container is configured as an HEB, you can easily have 2 plants per container using an 18 gallon container. It might even be possible to grow 3 plants, especially smaller varieties, although staking would be a challenge. I'm curious if someone could report their results of trying 3 plants in 18 or 20 gallon containers.
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