0 */3 * * *  /usr/bin/php index.php --task=update:clients:userdefined --hours=3 > /dev/null 2>&1
20 */12 * * *  /usr/bin/php index.php --task=update:clients:userdefined --hours=12 > /dev/null 2>&1
40 0 * * *  /usr/bin/php index.php --task=update:clients:userdefined --hours=24 > /dev/null 2>&1