what is the fair wage of being a part-time tour guide

I am NOT a full-time nor part-time tour guide and I am not working in the travelling industry either.

I have someone (1 person) who wants me to bring him to another
country that is 10 hours flight away from us , because he needs me to help verify and identify something with my profession so he must be bringing me up , but not an ordinary full-time tour guide.

I'd like to know what is usually the fair rate of wage of a tour guide usually for a day? I have no idea in this area.

 

if it was me, i would make him pay all my expenses and i'd be happy with the free trip.

 

So you are getting hired for something else and not as a tour guide. So you should get paid what is usual in your profession. Plus expenses since you need to travel.