I gave a 30 day notice and paid for C&C. My BO treated me and my horses like crap, so I moved after 2 weeks and paid board at the new barn as well.
Learned my lesson so thereafter I paid board, gave notice at same time, and moved immediately. Better to pay double board that have hostile conditions.
At that first barn I told a kid’s mother to give a 30 day notice. BO quit feeding her pony! They had to feed, and fortunately lived down the street. Next person I just loaded up her horse for her on the day she moved.
Last barn I asked the BO how much she wanted. She gave a low amount so I doubled it and kept the email for my records.