What size coop and run do I need for 5 orpington hens and 1 cockral?

[leanne2015]

They will be free ranging outside on about an acre in the day. The coop and run will be used for night and if I'm away for a few days.

What's the minimum size coop and run?

 

[redsoxs]

Here's a link that talks about space requirements for chickens: https://www.backyardchickens.com/a/how-much-room-do-chickens-need