Sorry for the noob question but I am trying to understand real world cases. I know people need money but why not work all hours in one job?! I have been living in different countries (rich and poor) and people working for two companies at the same time is not a common practices. Is the opposite. In these countries unfortunately is hard to find a job if you only can work a few hours per day/week. In my personal case (not US) I am not allowed by contract to have a second job.
Working for two companies, how many hours/week is needed in your experiences?