[philliphaydon]

I tested 9.4 ages ago by polling a table. Upgraded the instance type while in multi az. The down time was about ~14 seconds.

With SQL server it was about ~50seconds.

2 minutes seems like a Long time but I'm curious now and want to test this again and maybe blog about it.

[vacri]

I haven't tried for a while - my method for outage detection was simply trying to make a connection. It wasn't always 2 min, but usually somewhere between 1-2 min (never more, though).