Measuring durations

When measuring durations, I carefully trim the audio in a wave editor to within ¼-second of the start and end of musical content, so
that any between-track pauses, tape hiss, or tape bleed-through normally isn't included in the measurement. I then use the duration
the editor tells me. However, since fractional seconds are not really supported anywhere, I typically have to round to a whole
number of seconds, and I am often unsure whether to round up or down.

Of course I realize the normal way of rounding in math is to disregard fractional seconds below 0.5, otherwise round up to the next
whole number. But I'm never quite sure what to do with fractional seconds between about 0.2 and 0.7. For example, it feels harmless
to round 3:05.185 down to 3:05, but 3:05.389 is starting to get into "I'd miss the very end if I cut it off at 3:05...how can I say
it's only 3:05?", especially if there's no fade-out. But then, it seems unfair to say it's 3:06 when it's really not even halfway
there.

What does everyone else do?

Edited by mjb50

Since this is "Clock" timing, wouldn't it make sense that anything before the mark of the next second still belongs to the previous one? sort-of like if
you would still say it's 12pm even though the clock says 12:00:59?