How Big Should A Run Be?

[silver1polish]

I just wanted to know what should run dimensions be for 3 hens? Would 15ft long, 4ft wide and 6ft tall for a run be good? or to small?
I don't have a big yard since we are "Urban" chicken keepers. I have 2 Bearded Polish and 1 Rhode Island Red.

 

[QueenMisha]

The ideal run is as large as you can feasibly make it.

However, 10 sq. ft. per bird is the minimum.

15 x 4 is fine for 3 birds.