Hour field for task schedule. The field uses the same format as unix cron. Some examples are:<br/><ul><li><strong>*</strong> Every hour</li><li><strong>*/2</strong> Every 2 hours</li><li><strong>2-10</strong> Every hour from 2am until 10am (inclusive)</li><li><strong>2,6,9</strong> 2am, 6am and 9am</li></ul>