How to properly set up an ssh connection so that the id_rsa key does not fly off when the system is turned off?

Question

SSH

Good afternoon, comrades.
With each new session, you must execute the command ssh-add ~/.ssh/id_rsaand enter the phrase, but this key is stored only during the current session.
This is necessary to connect without a password on a remote server.

Is there an option to save the key for a long time or script the scoring of the phrase while maintaining security?