10 minutes? The demo allows you to set up a Wordpress blog in literally 10 seconds (it's four clicks and no typing or scrolling -- not even to log in). I'm not sure why that's so onerous, even for folks with short attention spans.
It's not onerous at all, but you have to get people to the point where they're actually at the demo. My "10 minutes" was based on the thought process that goes through my head when I see a "try our demo" link. If the demo takes only 10 seconds, that's highlighting a major selling point of your platform, so make that explicit.
How about 'Run X in Y minutes' (somewhat after the Learn X in Y series).
Maybe we should change the button text to "60-second demo" or something...