how quickly do structures/fields decay when unclaimed?

[Ravi]

So i am out in the middle of nowhere on bumpy ground and and a tiny tiny claim. I would rather have my claim be just my house for now.. once I get the ground flat enough. Fields look pretty big so I'd rather not have to claim fields I make until I have enough humors to kill crickets for claim upkeep silver. So if you make a field on unclaimed land how long does it take for it to decay? I'm hoping I can make fields and farm them and over time expand my claim to cover them.
(also if I make a second claim as a farm area do I have to walk back and forth between claims or is there a teleport option to travel between homestead claim and normal not homestead claims?)

[staxjax]

Decay on buildings and objects is completely random, but unless something has changed tilled fields won't get hit by decay.