Formatting question: how to format duration (time spent)?

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I now see the answer in another thread: https://www.office-forums.com/threa...tions-mm-ss-not-clock-times-then-sum.1189556/. It's annoying, however, that in scanning over the cells or trying to edit them, even the custom setting of h:mm shows clock time instead of what's entered, e.g., 0:25.