You'll need to refer to your contract. Unless there are state/local laws to the contrary (I am in VA, sorry), the sellers are only in breach if they fail to do something that the contract requires, and there is only a time line attached if the contract, or a notice pursuant to a contract term, specifies it. Same advice for the furniture - what does your contract say? Most say the property will be in broom clean condition with all items removed. Failure to remove personal items, absent another agreement, might be a breach of contract.