Relegation is instant. How long a team spends in Serie B is entirely dependent on their subsequent performances.After being demoted last time out, Cagliari, Genoa and Venezia will all be hoping to secure an instant return to Serie A by winning promotion this season. However, many teams spend several years outside the top division before they are able to get back in. It is not unheard of for sides to suffer relegation to the third tier before they win promotion again.