The supporting documentation you are looking for is here
Please find the section, the requirement you are looking for is here:
You can configure the maximum age of the cookie. To do that you will need to modify the
<jira-application-dir>/WEB-INF/classes/seraph-config.xml file of your Jira installation directory and insert the following lines below the other
<init-param> <param-name>autologin.cookie.age</param-name> <param-value>2592000</param-value> <!-- The value of 30 days in seconds --> </init-param>
Here for 14 days, it'll be 1209600
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