# %\_length% and %length% **URL:** https://community.mp3tag.de/t/length-and-length/9971 **Category:** Support **Created:** [February 25, 2010, 5:02pm UTC](https://community.mp3tag.de/t/length-and-length/9971 "2010-02-25T17:02:31Z") **Posts on this page:** 1 **Showing post:** 1
### Author: ![stanman](https://community.mp3tag.de/letter_avatar_proxy/v4/letter/s/c5a1d2/32.png) [@stanman](https://community.mp3tag.de/u/stanman) #### Post date: [February 25, 2010, 5:02pm UTC](https://community.mp3tag.de/t/length-and-length/9971/1 "2010-02-25T17:02:31Z")
The first one %\_length% is a file attribute and is the running time of the song in minutes and seconds (mm:ss). All tracks have this field. The second one %length% is a tag and is the running time of the song in milliseconds. I have some tracks that have this tag and some that don't. Does anyone know how this tag is created? I've tried several different media players (WMP, Musicmatch and Quintessential) and none of them create this tag. I'm wondering why some of my tracks have it and some don't and how it got there. I think I'm just going to delete that tag off all my tracks since is seems redundant when you have the other field. Has anyone found a use for this tag? --- _[View the full topic](https://community.mp3tag.de/t/length-and-length/9971)._