First of all, open the Create Policy window via Products>Policy>Create Policy.
Under the Options tab, select Mandatory; and then, ensure Send to MetaEngage is ticked:
Under the Recurrence tab, you can set the Occurrence, Start Date and Completion Time Period:
Note: The Completion Time Period begins from the date the user(s) are targeted.
Related article: For How Long Can I Snooze a MetaEngage Policy, Survey or Course? – MetaCompliance