WWOOF Italia is a Volunteering Association, there is no contract or amount of hours to be respected. Remember that you're going to share a lifestyle, a project, not paying for food and lodging with a few hours of work. Each job and every season requires different times and commitments, you will have free moments for yourself, to rest and visit the area at your leisure. Before you go to a farm it is a good idea to ask the host what activities you will be involved in and what the daily rhythms you face will be.