>>16486083
>However...
...this is obviously the most pessimistic estimate.
Lettuce have minuscule amount of calories, you will probably want to grow much better food (like potatoes), which will decrease the amount of space required.
Also, lettuce in grow-boxes should have a much faster growth rate than the 42 days needed to grow outdoors.
Also, if you have a sedentary lifestyle, you could be fine with just 2000 cal. a day.
Also, that grow-box wastes a lot of space, for example you could remove those thick separating walls and enlarge the racks to fill the whole available space.
All these things considered, you could easily reduce the number of needed grow-boxes by about a half or even more.

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Would a grow-box of this size be enough by itself to completely satisfy a single person's food needs, provided there is enough variety of…