My interpretation of using the "largest" option in this way would be that once days > 0, seconds are no longer displayed. In the context of something like a duration that counts up live, it's somewhat incongruous to see a large number of days alongside a precise number of seconds, but only once an hour.
I'm not entirely sure if this qualifies as a bug, but it wasn't what I expected.
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or alternatively
My interpretation of using the "largest" option in this way would be that once days > 0, seconds are no longer displayed. In the context of something like a duration that counts up live, it's somewhat incongruous to see a large number of days alongside a precise number of seconds, but only once an hour.