Got through my first full questionnaire today for 50 miles after a few months of getting 3 for being disqualified for some reason. (They don't tell you why; probably figure it would help you lie next time.) Not a great return on the time, but I may suggest to my wife that she sign up so her miles don't expire from inactivity. Wouldn't happen until late 2020, as we already have AA travel booked for May, and probably not even then - but it might. (I have an AA credit card that pretty much guarantees that mine won't.)