However, if the number of hours worked in all jobs is unknown as in the Switzerland survey, the number of hours worked in the main job is considered instead. In the case of Chile the number of hours worked is used, with no details provided on which jobs are included in this definition. The survey that is used for the United States builds the number of hours worked on several very detailed questions, and the high number of hours worked may be due to this particular set up that is not comparable with other surveys. In the case of Korea and Japan, there is no information on whether the reported working hours refer to the main job only or all jobs held by the individual.