Professions with many self-employed workers tend to have more hours than professions with more employees. At the top of this list are the farmers and fishermen/women who have to look after the animals even on weekends.
Insurance brokers and IT professionals (Software developers) also fall in the top 5 professions with many self-employed workers with many working hours.
Professions with mini-jobs tend to have the lowest working hours e.g. in the hotel industry.