Hinduism - Kumbabishekam - what is called Kumbabishekam?

suppose a temple to which kumbabishekam performed in 1992. When the next kumbabishekam to be done ? what is the motivation of the kumbabishekam ? please enlighten with details.

Is this as per Agama or any other shashtras ? How ?
Update: The rule is for all shaivat and vaishnavat temples or not ?
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