How Long Notification Stays in bell icon

Summary:

We would like to know once user gets notification, How long notification stays in bell Icon.

Content (required):

We would like to know once user gets notification, How long notification stays in bell Icon.

• Is there a Time Limit like in days or weeks.
• Can we configure timer for notification?

Version (include the version you are using, if applicable):

Code Snippet (add any code snippets that support your topic, if applicable):

Thanks,