A skill class is a method to improve skills by attending one at a rabbit hole in The Sims 3. All skills except Photography, Martial Arts, Nectar Making, and Sculpting have their own class at a rabbit hole. Generally, the standard fee of a skill class is §400, and a class lasts for an hour. This is not always the case; for example, Mixology and Riding classes costs §500 and lasts for two hours, an Advanced Technology class costs §500 and lasts for three hours, and so on.