_pk_id – 13 months (used to store a few details about the user such as the unique visitor ID)
_pk_ref – 6 months (used to store the attribution information, the referrer initially used to visit the website)
_pk_ses, _pk_cvar, _pk_hsr – 30 minutes (short lived cookies used to temporarily store data for the visit)
_pk_testcookie is created and should be then directly deleted (used to check whether the visitor’s browser supports cookies)
mtm_consent (or mtm_consent_removed) are created with an expiry date of 30 years to remember that consent was given (or removed) by the user. It is possible to define a shorter expiry period for your user consent by calling: _paq.push([‘rememberConsentGiven’, optionallyExpireConsentInHours]). Learn more in the Asking for consent developer guide.
mtm_cookie_consent is created with an expiry date of 30 years to remember that consent for storing and using cookies was given by the user. It is possible to define a shorter expiry period for your user cookie consent by calling: _paq.push(['rememberCookieConsentGiven', optionallyExpireConsentInHours]);. Learn more in the Asking for consent developer guide.
matomo_ignore – 30 years
matomo_sessid – 14 days (It is important to note that it doesn’t contain any data used to identify visitors and is considered an “Essential” cookie)

Sala Kamal Ranadive