That could be 1 ft by 30 ft, 5 ft by 6 ft, 3 ft by 10 ft or any other dimensions that multiply out to 30 square feet
I have 5 girls, we have a 10 by 10 by 10 by 10,( we use a dog kennel ) and a 5x6 foot coop. we know now its really not enough room so we are paying for a new run, and some alterations on the coop. the new run will be 10 by 15 ft , thats 10 feet wide, by 15 feet long. If I was smart I would have saved my self almost 600.00 and never bought the dog kennel and got a real pen made . if you want the girls to be happy, all penned up then you will have to make it bigger so they have room to play roam etc. other wise I think any animal penned up in to small of an erea does not mentally fare well. even if you must make it the 10x 10x 10x 10, it will be big enough, we are just not going to let the girls run loose this summer as it was to messy and the dogs eat the poo. we are making the pen much bigger for this reason.