"How can it be otherwise? You'd need scheduled downtime to do it any other way." Trading floor is only open a few hours every day, the functionality being roll

"How can it be otherwise? You'd need scheduled downtime to do it any other way." Trading floor is only open a few hours every day, the functionality being rolled out required the markets to be open. Furthermore, since the changes were all for new functionality they rolled it out in stages days ahead of time (good move).