# How to calculate session durations?

**URL:** <https://discuss.elastic.co/t/how-to-calculate-session-durations/189046>\
**Category:** Kibana\
**Created:** [July 5, 2019, 8:50am UTC](https://discuss.elastic.co/t/how-to-calculate-session-durations/189046 "2019-07-05T08:50:00Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Havana](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/havana/32/47091_2.png) [@Havana](https://discuss.elastic.co/u/Havana)\
**Post date:** [July 5, 2019, 8:50am UTC](https://discuss.elastic.co/t/how-to-calculate-session-durations/189046/1 "2019-07-05T08:50:00Z")

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Here is the table I created to show the max and min value of each session.  
I want to know the duration of each session, which is calculated by max-min.  
How could I do that?

 ![39](https://us1.discourse-cdn.com/elastic/original/3X/c/7/c728f832ecd9955f71289b601bf8931c06ab18a2.png)

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**Author:** ![parallelthought](https://avatars.discourse-cdn.com/v4/letter/p/35a633/32.png) [@parallelthought](https://discuss.elastic.co/u/parallelthought)\
**Post date:** [July 5, 2019, 9:38am UTC](https://discuss.elastic.co/t/how-to-calculate-session-durations/189046/2 "2019-07-05T09:38:02Z")

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You can create a custom field for calculating the time difference using the painless script. There is an example available at [https://www.elastic.co/blog/using-painless-kibana-scripted-fields](https://www.elastic.co/blog/using-painless-kibana-scripted-fields)

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**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [August 2, 2019, 9:38am UTC](https://discuss.elastic.co/t/how-to-calculate-session-durations/189046/3 "2019-08-02T09:38:03Z")

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