Change WordPress login cookie expiration

change_cookie_lifetime.php

<?php
/**
 * Change WordPress login cookie expiration.
 *
 * The WordPress cookie login standard life is 14 days.
 *
 * The WordPress constants for human readable intervals are:
 * MINUTE_IN_SECONDS
 * HOUR_IN_SECONDS
 * DAY_IN_SECONDS
 * WEEK_IN_SECONDS
 * MONTH_IN_SECONDS
 * YEAR_IN_SECONDS
 *
 * Add this function in your theme's functions.php file
 * or in your custom functions plugin.
 *
 * @since 1.0.0
 */
function wpsvn_change_cookie_expiration() {
	return YEAR_IN_SECONDS;
}
add_filter( 'auth_cookie_expiration', 'wpsvn_change_cookie_expiration' );