Refreh frequence of a template sensor platform sql

Hi there, what is the refreh sequence of a sql template sensor?
I know, that a sensor changes, when the value changes. But how often will the sql-statement be executed? I try to avoid too many db accesses.

The SQL sensor is a local polling IoT class:

Screenshot 2021-10-07 at 20-00-42 SQL

Pretty sure the default for this is 30 seconds, but you can change it if you wish:

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