How long to wait before running with a stress fracture

I got a question from a runner who's had a metatarsal stress fracture who's very frustrated, who's trying to figure out how to get back to running.
He went and saw a doctor and he was told that he had a stress fracture and the doctor told him to take some time off of running.
Then he started watching some RUclips videos, started listening to some podcasts, and then asked me a very serious question:
How long do I have to wait to run with a metatarsal stress fracture?
Well, that's what we're talking about today on the Doc On the Run podcast.