Please help me in Orchestrator schedule to run every 15 minutes between 7:30AM to 17.15PM.
Welcome to the community @Putthipat_PJ. A quick search of the forums will reveal similar questions with guidance and solutions that may help you.
Please review the following post that I recently answered, it should provide you with sufficient details to help you along and understand the Cron Expression for Advance Scheduling.
Please have a read over Using Cron Expressions to see what is supported by the Quartz.Net framework used by UiPath. You can also find Cron Expression generators such as https://www.freeformatter.com/cron-expression-generator-quartz.html.
If you are having troubles writing the cron expression, please provide what you have come up with and I’d be happy to take a look!