How can I schedule a job after every 15 minutes in Salesforce?

Hi,

Jobs cannot be scheduled in increments smaller than one hour.

In Apex, you can schedule four jobs to every hour, staggered 15 minutes apart:

System.schedule('Scheduled Job 1', '0 0 * * * ?', new ScheduledClass());
System.schedule('Scheduled Job 2', '0 15 * * * ?', new ScheduledClass());
System.schedule('Scheduled Job 3', '0 30 * * * ?', new ScheduledClass());
System.schedule('Scheduled Job 4', '0 45 * * * ?', new ScheduledClass());