It was definitely longer than 90 minutes since my last update. I decided not to do a site wide alert, as we were able to get things a little more stable. Although things are not perfect as they stand right now. If you hit a couple specific servers, you are more likely to get a server too busy message. Other people are not impacted at all.
Our work on this continues and I've asked some of the other staff to update this thread with more information.