I’ll intellectually/emotionally/physically hard as answers. For me its either 12 hours straight “punching tubes” on a very large scotch marine firetube boiler at the beginning of my career or Easter around a decade ago when I was working with troubled teens and had to engage in 5 separate protective holds in one 16 hour double shift. The former was all physical and the latter was a combination of emotional and physical.
This is nothing compared to some of the shit in this thread, but I accidentally accepted shifts at three jobs that had me working 24 hours straight. Started loading in for some sort of concert at 4am, then at 9am I went for a shift at a cafe, at 2pm i left for a shift at a grocery store, at 10pm I left to start tearing down the stage I set up in the morning. I was finally done at 4am, 24 hours later. Got home at 5am and as I was washing up all my joints cracked and I had the longest fart ever.
*Accidentally because the stagehand job was on-call and they only called me like once every few months. It was good money, so I accepted it on the spot. WOOPS.
Yeah 24 hour stretches are no joke, mostly because of the driving at the end (for me at least). My standard shifts are 12s and I pick up a double every so often. Granted, I’m doing the same shit the whole time and most days it’s not very physical.