How far back a user can access their historical notifications?

Summary:

The notification I looking for from March/April was to do with Mid-Year Review documents. We ran the eligibility process so that it was assigned to everyone back then and I just wanted to confirm if everyone got a notification when we ran that process or not.

Also want to know in Oracle - Historical notification can be viewed through BPM worklist ? or any other means to get the above mentioned data

I tried advanced search but the page is unresponsive

Currently I am able to see only the notification till the Month of August.

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