I fully understand the need for regular server maintenance and have no objection to this process, but why persist with the "this process generally takes about 15 mins" message when (at least on server 6) it always takes 2 to 4 times this amount of time.
I am regularly online when maintenance occurs around 0330 server time and I have never seen it come back online in less than 30 minutes. Often, like now, it is coming up to 1 hour and it is still down.

By all means do the maintenance because it is important, but at least change the message to a more realistic timeframe please.