# 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:** 1
**Showing post:** 2

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### Author: ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@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")

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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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