It depends, but it's not dependent on the number of microservices. They are usually tasked with fixing some bug in a specific service, maybe 2, so they open tho

It depends, but it's not dependent on the number of microservices. They are usually tasked with fixing some bug in a specific service, maybe 2, so they open those services and point any URLs being referenced to Dev services so they don't have to run everything on their machine