Hi, me and some freinds are planing to move to some land in spain owned by one of my freinds fathers, my question is:

How long can we stay there without needing to apply for resedancy?
And
If there is a limit how soon can we come back after leaving?

we are planning to live fairly self sufficiently so work will not be a majour issue as we all have concearns back in the uk (we are all brittish citizens)