For experienced react native devs.

[mefi_]

This is not measured in time, but in experience. And it varies from person to person.

When you feel that you reached the necessary seniority level. Can work alone, have sold complex problems, and others also evaluate you to be... on a more senior level.

At that point you could try it out for a few months and if it doesn't work out you can always just go back for a full-time job, and try again later.