Gregory Nutt 2208aabbc6 Correct elapsed time calculation
Elapsed time calculation must always be be the current time minus a time in the past.  Not vice versa.

Also corrects and improves some comments.
2021-03-19 23:18:28 -07:00
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2021-02-25 11:31:49 -08:00
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2021-03-19 23:18:28 -07:00
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