Hello Junes,
as Audio Editor and Engineer I'd be pretty interested in your project.
I have multiple years of experience in the field and I've worked with Audio Producers and Videomakers to solve similar issues and to improve audio recordings.
Being an Avid Pro Tools certified operator and working with amazing tools ofr audio restoration, I think I could really help you out.
If interested, visit my profile with more than 150 projects completed and positive feedbacks; my reviews will give you a better awareness of my dedication and passion.
I'm bidding 50 as average for videos from 40min to 2hours, as each video might need more assitance in precise points and so require more analysis, processing and so time.
Let me know if you have any deadline to respect, in order to organise myself to give you a good and fast service.
Kind regards,
Mauro