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There is no real time frame to finish most jobs.
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You also have to work nearly 5 to 7 days a week. For example, you can do private investigation, but the investigation may take a whole day to do. Allows you to work with your sims on the job. You just can't jump into the investigation career. Meanwhile some of the profession requires you to have your character to have some kind of foothold such as a significant amount of skill level. Most of all, you can jump into a career and build yourself up. Your job can consume your social life depending on the job you get like the Sports career. You can't see your character doing their job unless they get a special assignment like casing a place in the Criminal career. You can keep focus on more than one sim if they are working in a careers since they are safe in a rabbithole and won't idle if you do nothing. You have a social life with your co-workers. Most jobs don't require much to perform at 100%. It's easy to move up the ladder, especially with certain traits. You social life is based on the job you get. Co-Workers are not assigned automatically. where you actually have full control of your sim while they are working.
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Professions (Jobs) are the ones like those added with the ambitions expansion, fire fighter, ghost hunter, private investigator, architectural designer etc.
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Unemployed residents are automatically assigned role positions by the game. Careers are the default jobs, like doctor, teacher, scientist, etc.
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