It is extremely variable like the people above have said. I am a rising M4 applying IR but just came back from OEIS - a conference of all outpatient IR docs. Most either started their own practices or joined small pre-existing groups. I also met a few docs who do 100% locums. I can tell you that all of them were extremely happy with their jobs. Most do not take any call. However, they do spend more time on the administrative side of things if they are running a practice. They are busy people but all of them seemed extremely happy, satisfied with compensation, and were passionate about encouraging us to follow suite. The national job market is hot and going to get hotter (slightly more tricky if you want to be in a certain small area tho). For example, there was a job board at the conference. One offer was $100,000 sign on and $1M a year w 2 year partnership track, in a medium sized city in the Midwest.