You should be able to view the application duration by going to the Adoptions section.

For new application, there's a Submitted column that showcase the time from when the application has been submitted.

For application's under review, go to In Process section, then click on the Pet Details link of the pet you wished to check. Under Applications section, there's an Elapsed time column that showcase the application's duration.

* Note: Time starts once the application is submitted

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