[JSoet]

Definitely not impossible, one of my co-workers switched to only working 3 days a week last year. He lives a fairly frugal lifestyle and enjoys more time for other things, so it works well for him... But it wasn't easy for him to get either, they originally told him he'd only be able to continue like that on a temporary 4 month contract... But we work in a larger bureaucractic company, and after a couple months it was clear that we wouldn't get approval to automatically replace him any time soon if he left completely, so it made more sense to keep him permanently even at 3 days a week, rather than have no one new. It helped that he was one of the better performers on the team, so even at 3 days a week he's very productive, he's just taken less of a role on many of the side tasks that he used to do.