How to escalate all invoices at a specific hour of the day?

Currently, invoices are escalated at the exact hour the last action was performed.

For example, if an invoice was assigned for approval at 12:00 PM PDT, it will escalate after 10 business days at 12:00 PM PDT.

However, management would like to modify this process so that all invoices reaching their 10 business-day expiration are escalated at a single set time, specifically at 10:00 PM PDT.