Yup. My girlfriend's dad was an IBM mainframe troubleshooter in the 80s. IBM would tell him to be on a plane in 45 minutes, go fix a mainframe, and then go do it again. I think he burned out after a few years, or maybe he quit when they told him to cut his hair. I know I don't have the constitution to be in permanent fire-fighting mode and short notice on-call like that.
He's been a high school teacher ever since.