We have a requirement that needs a Job scheduler to run daily on recurring basis. It should run every 1 hr  - starting at 6.15 AM and ending at 8.15 PM.

Pega help advised :

[Configuring a Job Scheduler with a Cron Expression:

• Create or open an existing Job Scheduler rule.
• In the scheduling section, select the "Cron Expression" option.
• Enter the desired cron expression in the provided field.
• Configure other Job Scheduler settings as needed, such as the activity to be executed and the access group context.
• Save the Job Scheduler rule.]