What does ED mean there? Here I think it is an abbreviation for erectile dysfunction, at least that's the way it's referred to in radio ads. And in that department I don't think 36 hours without a break qualifies.

>If you visit an ED at the weekend, the resident physician who deals with you may have been on shift without a break for 36 hours. And now she's going to stick an instrument in you or prescribe medications.
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>FWIW, that's progress: in my day we'd start on Saturday morning and remain on duty until Monday afternoon- a 56-hour shift. We did that every second weekend while still working Monday-to-Friday with one or two of those weekdays being 32-hour shifts as well.