By default WordPress runs its wp-cron.php too frequiently, so to change it:
Update wp-config.php with the following line:
define('DISABLE_WP_CRON', true);
Setup manual cron job for wp-cron.php
Enter user’s crontab
crontab -lu USERNAME
And append command to run cron every 12 hours
0 */12 * * * cd /home/USERNAME/public_html; php -q wp-cron.php
or
0 */12 * * * wget -q -O - https://alltme.pp.ua/wp-cron.php?doing_wp_cron >/dev/null