# Heartbeat frequency ( publication period )

**URL:** <https://forum.opencyphal.org/t/heartbeat-frequency-publication-period/851>\
**Category:** Libcanard\
**Created:** [June 5, 2020, 11:46am UTC](https://forum.opencyphal.org/t/heartbeat-frequency-publication-period/851 "2020-06-05T11:46:56Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![hugo](https://forum.opencyphal.org/letter_avatar_proxy/v4/letter/h/b38774/32.png) [@hugo](https://forum.opencyphal.org/u/hugo)\
**Post date:** [June 5, 2020, 11:46am UTC](https://forum.opencyphal.org/t/heartbeat-frequency-publication-period/851/1 "2020-06-05T11:46:56Z")

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Hello

The spec says:

```auto
uint16 MAX_PUBLICATION_PERIOD = 1 # [second]
# The publication period shall not exceed this limit.

```

I would like to know which frequency is commonly used for the heartbeat please?  
Is there a rule of thumb for setting the period?

-H

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<div class="post-metadata">

**Author:** ![deekay](https://forum.opencyphal.org/letter_avatar_proxy/v4/letter/d/8491ac/32.png) [@deekay](https://forum.opencyphal.org/u/deekay)\
**Post date:** [June 5, 2020, 2:21pm UTC](https://forum.opencyphal.org/t/heartbeat-frequency-publication-period/851/2 "2020-06-05T14:21:38Z")

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I would say it is application dependent… How fast response time is needed to detect missing node?