I was guessing long something around the lines of 24 hours, maybe a bit longer
So it'll be just a few hours for the core to be back (the basic forum), but quite a bit longer for the parts that need special replacement like Shoutbox, Arcade, My Topics, etc...?
Depending on how long the shoutbox will be inactive that might cause a bit of an influx on the chat (considering people know how to reach that)...
I'm assuming whatever you stored in My Topics will be gone, so everyone will have to backup that list?
Is there anything else we should worry about backing up?
What effect will this have on labels in private messages?