Hi and thanks for the opportunity!
I have a project studio where I can take care of what you need pretty quick. If the background noises are in between conversation it will not take me very long to finish. If they are partially overlapping with speech, that is a different story.
Either way, I can get it done within 2 days tops. I generally ask for half down to start and last half when the job is complete and you are satisfied.
Thanks again!
Carl T.