Scenario: CustomerC requested additional information from the parts department through the customer survey and has not received a response one week later.
Imagine having a process where you want to give someone a couple of days to reply to an approval. If that someone doesn't respond in time, you want to assign a new approval to another person or group of people. To achieve this you can set the timeout in the action settings.
Reference:
https://www.o365dude.com/2018/06/02/timeout-flow-approvals/