Just did a DS about cell phones, tablets and computers. 45 minutes. At the end you enter your phone number for a follow up survey which I did. I kept getting a message to enter a number even though I did enter my real phone number, then tried my cell number, same message so the survey did not submit. I usually just roll with surveys, but this is the 3rd time in the last week that a completed DS ended without going back to the SR congrats screen. Now, of course there are no surveys.