And then they would be applying the update on a Friday and going home for the weekend. So if/when anything breaks they would have to be in for a weekend callout. This way they will have coverage in office for the 24 hours following release and can react/respond quicker should a crisis occur...So instead of waiting 11 hours before they start the update they wait 24. Either one would have been better instead of during the event.
Back when I was working in a production environment we NEVER applied updates or patches before a weekend - nor during the week of a holiday - as getting in-house coverage for the critical time post update was nigh on impossible.