I broke one of my own rules of not attempting a survey that is longer than 25 minutes on most, not all, of my sites.
I am talking about a site other than FC but one where I have established the 20 minute rule. I also have made this rule for FC.
I had a 25 minute survey on the homepage of this other site. I had time and thought, "why not. give it a go"? It turned out to be an interesting survey. I completed, even making some comments at the end, and submitted only to get the "oops. we are sorry". I did not even get the sometimes small DQ bonus.
I Should Have Known Better.