No. It does not.
In fact, the evidence contradicts your explanation. Cox also put a hang tag on our mailbox. The tag has only two pre-printed time slots: morning and afternoon. It also says outages usually last less than four hours. Dividing 24 hours in a day by 4 yields six possible time slots. But apparently Cox does not want to pay overtime or take other steps less likely to inconvenience end users.
For example, Cox could monitor total traffic in a neighborhood and then select a 4-hour slot when traffic is minimal.
The fact that the hang tag has only two preprinted time slots speaks volumes about whose convenience Cox values most.