It was a disaster this past weekend, 6/2. SDD was down for the entire EMM, and then some. I don't know how often it goes down for EMM, or rather, doesn't get up and going in the morning.
As was ToT.
As to timing, DGD and I took Uber and were dropped off at 7:28, for an 8:00 AM opening. No bags so we walked through very quickly and right in to tap in the gates and they were scanning in for EMM just inside there. We walked right back to ToT (to find it down) and on to RnR instead, with everyone else. Wait said 50 min but it was only about 20
I checked over in TSL and saw SDD down and lines/waits for TSL and AS2 were building FAST, both up to 45 min within minutes. I'm sure anyone heading to SDD had headed to those instead.