How often should the sitter come over?

How often your sitter comes over is really up to you and your cat. Is your cat accustomed to being alone for long stretches time? Does he cling when you get home at the end of the day? Or does he greet you and then go back to what he was doing? Depending on how independant your cat is, once a day may be enough; if not, then twice a day should be plenty. A daily visit is recommended, as opposed to every other day, because cats need that human interaction to let them know that they haven´t been abandoned.