I just filled out this (unpaid) survey for OPEN, which is a polyamory advocacy organization! It took me 12 minutes. The survey description says they expect it to take 20-30 minutes, which makes sense - I'm fast at answering surveys.
Here is the link they told me to give people, which seems to tell them you were referred by a participant, but not which one: https://chapmanu.co1.qualtrics.com/jfe/form/SV_3qvDjh6xlTrjEZE?Source=participant
And here is a link with all tracking removed: https://chapmanu.co1.qualtrics.com/jfe/form/SV_3qvDjh6xlTrjEZE