It is always a nice practice to disable automated cron module and setup Drupal cron tasks from the crontab in linux and use of Drush instead of hitting a request on Drupal generated URL. Here is the way to achieve that:
1. Enter command crontab -e to open the cron tab in editor.
2. Enter the following line and save the file.
0 */2 * * * cd /var/www/html/example-drupal && /usr/local/bin/drush cron
So this will ensure cron runs every 2 hours. Make sure to set correct Drupal directory and drush path.