The hour at which the network outages start will likely be sometime at night so as not to disrupt the flow of traffic (what little there is this time of the year, anyways) during the business day, which means that we'll be, in the words of a certain Mr. Lieutenant Commander Data, igniting the twilight petroleum.
[size=8pt]Seems the most reasonable course of action, I think. Do all the big work during the times when almost nobody's likely to be using it. That's how WSDOT've does things for years, anyways.