The Removal schedule is a feature of Nutanix Era that allows you to specify when a database clone will be automatically deleted. You can modify the Removal schedule of an existing clone by selecting the clone from the Clones page, clicking on the Update button, and changing the Removal schedule option to the desired date. This way, you can extend or shorten the lifespan of a clone as per your requirements. You do not need to remove the existing Removal schedule and add a new one, as this would be an unnecessary step. You also do not need to update the Removal schedule to the end of the month, as this would not meet the request of keeping the clone for an additional 14 days.
Reference: Nutanix Database Management & Automation Training Course, Module 4: Protecting Databases Using Time Machine, Lesson 3: Cloning Databases, Slide 10: Clone Removal Schedule Nutanix Certified Professional - Database Automation (NCP-DB) 5 Exam, Section 5: Protect NDB-managed Databases Using Time Machine, Objective 5.3: Given business requirements, perform a database clone