This is not a technical issue, exactly, but a warning that I just finished the most tedious survey of my life. It DID credit, but it was 35 minutes of rating my vehicle, each time having to choose exactly ten responses for about a million different driving occasions, then picking the three most important and three least important of the choices. I stuck with it so I could rate it (it was an SSI) - cleary the person who wrote the survey never actually took it.

But it did credit and it does give me another contest entry, so that's good. It was an awful survey, though!