6 hour downtime posted. My bet: around hour 6, "we are investigating potential issues with today's patch and are extending downtime. We have no current ETA." Overall I'd expect about 30 hours downtime. Will the problems. E fixed? Doubtful.
Probably going to mess around with server setting to get the dumpster fire smothered. That and the patch I am thinking 10 hours. The catch will be when live logs in we are going to inherit the problems as live will have less resources allocated.
But will it be 1 or 2 times the servers come down after the patch. Usually a crash and then an emergency patch after the original patch with no eta as they are troubleshooting. I would not plan on playing at all tomorrow.