Need to Display a warning message during specific time for example 8:30 AM Daily PST

Hi All,

We have a process model running at 8:30 AM daily which will perform some updates in the database, this process will take maximum up to 5 minutes to complete. During this time we need to freeze home page for 5 mins by showing some warning message then after 5 minutes we can display the home page. How to achieve this can someone help us with this kind of scenario.

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