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SUBMIT YOUR IDEAGot a slightly different answer than the provided solution - but very close (presumably a rounding difference):
So a couple things fall out of this. You have to decide whether to translate to minutes before of after you add up. Not a big deal, I made the opposite choice from the solution.
Far more interesting is that the datediff() function has two properties I had not really thought about:
The experiment with datediff() is included in the attached WF and image inside the spoiler.
Matches output!
Really enjoyed that one! I'm off by a minute, but looks like I'm not the only one...