# Length of duration time
**URL:** https://community.mp3tag.de/t/length-of-duration-time/51044
**Category:** Support
**Created:** [December 5, 2020, 2:30am UTC](https://community.mp3tag.de/t/length-of-duration-time/51044 "2020-12-05T02:30:13Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@txumai](https://community.mp3tag.de/u/txumai)
#### Post date: [December 5, 2020, 2:30am UTC](https://community.mp3tag.de/t/length-of-duration-time/51044/1 "2020-12-05T02:30:13Z")
Length of tracks and therefore cause that the lists m3u with EXTINF they also have a second less than real always, according to the HTML5 audio.duration in durationchange event when reader.onload, and the same Windows Explorer
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### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [December 5, 2020, 10:22am UTC](https://community.mp3tag.de/t/length-of-duration-time/51044/2 "2020-12-05T10:22:26Z")
Could you check what kind of files you have got? CBR or VBR files?
For VBR files, the calculation relies on the first couple of blocks.
Also, you could check the files with mp3val and see if the header and stuff is ok.
See also e.g. this thread:
> [@\[X\] VBR Files have a wrong playlength](https://community.mp3tag.de/t/x-vbr-files-have-a-wrong-playlength/2281):
>
> Hi, I noticed that Mp3Tag reports a wrong play length of VBR files, this is not a big issue and does not affect the program at all. Beste Grusse aus Frankreich !
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### Author:  [@Zerow](https://community.mp3tag.de/u/Zerow)
#### Post date: [December 8, 2020, 1:07am UTC](https://community.mp3tag.de/t/length-of-duration-time/51044/3 "2020-12-08T01:07:45Z")
Maybe also this thread will give you the info you are looking for?
> [@SUGGESTION: Count the lengths of files with accordance to reality](https://community.mp3tag.de/t/suggestion-count-the-lengths-of-files-with-accordance-to-reality/45915/5):
>
> The problem seem to be very short files where naturally, the percentage of deviation is biggest in respect to the total length. But do other programs do it better? I took the value display from MP3tag, Foobar from the list, Foobar raw from the properties sheet and Windows Explorer. Here a selection File Mp3tag Foobar Foobar raw Explorer 1 00:02 00:02 0:02.250 (99 207 samples) 00:02 2 00:04 00:04 0:04.213 (185 795 samples) 00:04 3 00:03 00:03 0:02.913 (128 467 samples) 00:03 4 0…
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [February 9, 2026, 12:28pm UTC](https://community.mp3tag.de/t/length-of-duration-time/51044/4 "2026-02-09T12:28:57Z")