# How to understand the APM data span.duration.us value **URL:** \ **Category:** APM\ **Tags:** ui\ **Created:** [November 10, 2022, 5:48am UTC](https://discuss.elastic.co/t/how-to-understand-the-apm-data-span-duration-us-value/318611 "2022-11-10T05:48:20Z")\ **Posts on this page:** 3\ **Page:** 1
**Author:** ![pratikshatiwari](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/pratikshatiwari/32/116646_2.png) [@pratikshatiwari](https://discuss.elastic.co/u/pratikshatiwari)\ **Post date:** [November 10, 2022, 5:48am UTC](https://discuss.elastic.co/t/how-to-understand-the-apm-data-span-duration-us-value/318611/1 "2022-11-10T05:48:20Z")
Hello, I am trying to prepare custom dashboard by using [span.duration.us](http://span.duration.us) field. My query is what is the value inside [span.duration.us](http://span.duration.us) field is value in microsecond? If it is microsecond how do i apply logic to see them in milisecond in heatmap Regards Pratiksha ---
**Author:** ![Hayden\_WB](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/hayden_wb/32/100898_2.png) [@Hayden\_WB](https://discuss.elastic.co/u/Hayden_WB)\ **Post date:** [November 10, 2022, 2:25pm UTC](https://discuss.elastic.co/t/how-to-understand-the-apm-data-span-duration-us-value/318611/2 "2022-11-10T14:25:53Z")
Hi Pratiksha! Grabbed the below from the [documentation](https://www.elastic.co/guide/en/apm/guide/master/exported-fields-apm-span.html): ```auto span.duration.us Duration of the span, in microseconds. type: long ``` So looks like its in microseconds. ---
**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\ **Post date:** [December 8, 2022, 2:26pm UTC](https://discuss.elastic.co/t/how-to-understand-the-apm-data-span-duration-us-value/318611/3 "2022-12-08T14:26:30Z")
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