I guess I am fairly common example. I don’t manually edit track times. I generally use Picard to take times directly from the CD and upload the CD data directly.
The only time I would type numbers is if I didn’t have that actual CD. Then I would be either copying from the back of the Vinyl or CD cover and checking the times in my digital music player. All of these tend to just work to the nearest second.
If I was going to go into a full on pedant mode - I would use normal Maths rounding rules and “round to nearest”.
My brain starts churning into overtime on this one. Truncating the times seem illogical to me. As this is a music track it would take up space somewhere on tape\CD\whatever so would be more useful to be a rounded up figure so as to always make sure there was enough space on the medium.
Of more interest to me would be the fact there are gaps around tracks… so where are the gap times added?
Questions like that mean I try and just stick with what the digital media says is the length as I am mainly working with CDs and FLAC or MP3 files.