WordPress at a glance
filter is not described

user_request_key_expiration filter-hook . WP 4.9.6

Filters the expiration time of confirm keys.

Usage

add_filter( 'user_request_key_expiration', 'filter_function_name_3395' );
function filter_function_name_3395( $expiration ){
	// filter...

	return $expiration;
}
$expiration(int)
The expiration time in seconds.

Where the hook is called

wp_validate_user_request_key()
_wp_personal_data_cleanup_requests()
wp-includes/user.php 3471
$expiration_duration = (int) apply_filters( 'user_request_key_expiration', DAY_IN_SECONDS );
wp-admin/includes/user.php 715
$expires        = (int) apply_filters( 'user_request_key_expiration', DAY_IN_SECONDS );

Where the hook is used (in WP core)

Does not used.