The survey is rather extensive and will take you about 15 minutes to complete.
Opinion Miles Club:
https://www.opinionmilesclub.com/general/omc-lp-600
I got the 300 miles offer. Ended up being asked a ridiculous number of questions about my recent camera purchase. I qualified for the 300 miles (survey took about 12 minutes) and then was offered a second survey about allergy meds for 50 miles. I started filling that one out but must have answered a question that disqualified me. Oh well, at least I got the first one for 300 miles. Hopefully the miles will post. We’ll see…