I had a small amount of money in NetBank when they went under. I couldn't access the money for a few days. After ING acquired them, it was as if nothing had happened. So my downtime was something like 4 or 5 business days. I expect this is abnormal (takes longer usually?) but it is my only experience going through the process.
The greed of all these companies is mind boggling. Nothing like issuing a bunch of sub prime paper at the top of a multi year real estate cycle. Don't worry Griff or Warren Jr as I like to call him is ready to give you $.05 on the dollar, which is probably too generous. When your grandma is trying to sell real estate its time to bail.