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The answer in my opinion is "as few as you can bring yourself to have". I have kept chickens at 4 sq ft per chicken indoors (plus run) and at 15 sq ft per chickens indoors (plus run) and I gotta tell you, they really behave differently with the larger amount of space available.
I'm not telling you what to DO, that is a personal choice, I'm just answering your question -- it *does* affect their quality of life, in my observation, to have 4 sq ft apiece versus more ample quarters.
(It is also easier to manage and clean up after fewer chickens per unit area, and you are less apt to run into problems like smelliness)
Just sayin', good luck, have fun,
Pat