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.
I did deliveries for the postal service one summer 20 years ago. They always had you load up with just a little more than you had time to deliver, yet expect you to do it all. This one particular day it was scorching hot, and in addition to the regular small packages I had a fridge, a bike and a couch. All packaged to make them hard to grip. All to be delivered to the door, on the 4th, 5th and 3rd floor respectively. After ringing the doorbell with the bike in a box on the third floor and the Karen chewing me out for not leaving it downstairs by the garage I broke. Our supervisors at the time did call around to make sure people would be home, and check about floors, help to carry, and such. Such a request would’ve been noted on the package slip.
That job served as good motivation to stay in school and get a cushy SWE career.