Do I have to be a lawyer?

Whether or not to take shifts depends on the work you do: paralegals, interns and other paid jobs usually need shifts. If you are a lawyer who does his own business and gets a commission, you generally don't need to work.

On duty:

It means working in a designated office (usually with tables and chairs), and it is also stipulated that you can't leave the office for a long time without special things, which is easy to manage. This office system is the shift system.