Hello.
I am a UK British professional voice with years of experience and I have my own studio.
I produce broadcast quality audio.
I have quoted a low initial milestone and 10 days as a tentative schedule but, of course, I don't know what you require and that may have to be changed in line with a more specific specification.
I would you to know that I would require part payment from time to time during the life of the project. After all, I don't know you and, like most professionals in this business, bitter past experience has taught me to be wary of new clients.
Good luck with your project.
Brgds.
N.