Configure how often WordPress sends recovery mode emails about errors

By default, WordPress sends a maximum of one email per day to the site administrator if a fatal error is discovered. (Since WordPress 5.2)

To configure this, use the following snippet:

add_filter('recovery_mode_email_rate_limit', function($rate) {
  return HOUR_IN_SECONDS;
});

Instead of using one of the predefined constants like HOUR_IN_SECONDS, you can use any integer value, like 600, which would correspond to every 10 minutes.