# What is the unit of measure for rtt times in heartbeat

**URL:** <https://discuss.elastic.co/t/what-is-the-unit-of-measure-for-rtt-times-in-heartbeat/247455>\
**Category:** Beats\
**Tags:** heartbeat\
**Created:** [September 3, 2020, 10:12pm UTC](https://discuss.elastic.co/t/what-is-the-unit-of-measure-for-rtt-times-in-heartbeat/247455 "2020-09-03T22:12:51Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![aviationfan](https://avatars.discourse-cdn.com/v4/letter/a/c37758/32.png) [@aviationfan](https://discuss.elastic.co/u/aviationfan)\
**Post date:** [September 3, 2020, 10:12pm UTC](https://discuss.elastic.co/t/what-is-the-unit-of-measure-for-rtt-times-in-heartbeat/247455/1 "2020-09-03T22:12:51Z")

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I have a sample showing the following json snippet

```auto
    "tcp": {
          "rtt": {
            "connect": {
              "us": 79589
            }
          }
        },

```

Is that 79,589 nanoseconds?

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**Author:** ![warkolm](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/warkolm/32/39224_2.png) [@warkolm](https://discuss.elastic.co/u/warkolm)\
**Post date:** [September 3, 2020, 10:16pm UTC](https://discuss.elastic.co/t/what-is-the-unit-of-measure-for-rtt-times-in-heartbeat/247455/2 "2020-09-03T22:16:50Z")

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I am just guessing, but I would suggest `us` means microseconds. Hopefully someone that actually knows can comment 🙂

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<div class="post-metadata">

**Author:** ![aviationfan](https://avatars.discourse-cdn.com/v4/letter/a/c37758/32.png) [@aviationfan](https://discuss.elastic.co/u/aviationfan)\
**Post date:** [September 3, 2020, 10:18pm UTC](https://discuss.elastic.co/t/what-is-the-unit-of-measure-for-rtt-times-in-heartbeat/247455/3 "2020-09-03T22:18:49Z")

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I did not think of the greek Mu - that would make sense.

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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:** [October 2, 2020, 12:19am UTC](https://discuss.elastic.co/t/what-is-the-unit-of-measure-for-rtt-times-in-heartbeat/247455/4 "2020-10-02T00:19:01Z")

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