Doesn't the on-boarding process for a new hire (e.g., drug screens, paperwork, badge photos, etc.) usually take a month or so, anyway? I mean, unless you're applying for a new job a week into a current job, I don't even see how you can logistically fit that many jobs into a year.
Don't get me wrong, I'm a Millennial, and I can't see a single person in my generation being in the same job for more than 10 years (you're kidding yourself if we'd be at the same nursing job for our entire career). And in fact, I left my ICU job (the one that I had as a new grad) after a year and five months because I felt targeted by my manager (getting called into her office monthly, and then justifying myself made me feel like the "writing was on the wall"). However! I do think there should be a process where you've aired your grievances to management several times before you leave a job. Think about a bad relationship - assuming it's not abusive/dangerous, wouldn't you want to bring up the issues you have before calling it off? I get the sentiment that people can find themselves in jobs that are simply a bad fit, but I would presume the mature thing to do would be to list all the concerns you have, pen-to-paper, and then check in with your supervisor and/or manager to go through them. If they get angry and defensive, then you know you're in a toxic culture, but if they're open to exploring what has been done and what could be done to patch things up, then you ought to give them a real chance, I say. But no doubt, one has to be mercenary in America because the employer will happily exploit you to the hilt unless you develop leverage (i.e., marketable skills) and can skillfully negotiate what you want with a reasonable exit strategy if they won't do hardball.