How much should I offer for participating in a 200 question survey?

I am exploring MTurk and Prolific for collecting data for an academic research. The survey has 180 likert type (Strongly Disagree to Strongly Agree kind) statements and maybe 3-4 long form questions. What do you think would be a fair price? The research requires students (18+) or people who've recently completed their studies - I've not fixed a demographic yet but probably it will be western Europe.

If you were to participate, how much time do you think it would take, and would you be happy with €10-€15? Are MTurn and Prolific the best platforms to find you or do you have better suggestions?

submitted by /u/aladinmothertrucker
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source https://www.reddit.com/r/beermoney/comments/1cdh35j/how_much_should_i_offer_for_participating_in_a/