AD Full Import vs Delta Import

AD Full Import vs Delta Import

The Full Import imports all users from Active Directory.  Does the Delta Import also import new users from Active Directory every 30 minutes as well?  Or just changes?  If so, in our case the 7 days is not fast enough and I have to import Full Import every day with the number of user changes in the organization I work in.

Are there any other options?

Thank You
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