I've been reading a lot of 'recommended' sizes for coops... Some say 4x per some say 2x if they have access to free or semi-free range... I hope this thread helps find some answers...
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22 square feet for 10 birds. That would be OK to roost/sleep in for a week if they have access during daylight hours to that large yard you speak of. But if you're keeping them coop'ed up in there for a week, I think they'll get extremely unhappy.