How much should you tip on a free walking tour?

Hi everyone,

I’m planning to do one of the “free walking tours” during my trip to Copenhagen. On the website it says “pay what you consider with respect a fair and honest price for our work”, so I’m trying to figure out what’s considered normal or fair.

It would be a 2.5–3 hour tour with 2 people. What would you usually tip per person for something like this? Don’t want to accidentally overpay or underpay them.

Edit: I believe anyone can sign up whenever so it likely won’t be just 2 people. But I can’t see how many people sign up so at minimum, there’ll be 2 (me and my partner).

Author: BetterDays2cum