How big farmbot for self sufficiency?

How big farm bot is recommended for self sufficient gardening?
Say an adult would go completely vegan. How much land and hence how big farm bot would be required to provide enough veggies for one adult?

I guess I can answer myself after watching more videos.
Express and Genesis can provide veggies for one adult.
XL versions can provide veggies for family of 4 people (I guess 2 adults and 2 kids).
Having said that, provide veggies would mean just the recommended amount of vegetables and not the actual total calories requirement. That would require perhaps even 10x the size of XL to feed one person.

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