Apologize for the late response, my team is currently stuck with urgent issues. This will also take up today's time.
I understand your concern about the development time. I'm trying to get things finalize too. Before I confirm anything, I would like to discuss with my team so that we can provide full information at once. Together with the requirements, I'll also provide you with the related information about interfacing with other company if there's anything that can help simplify and save the time for development.
I'll finalize it as soon as possible, hopefully by Thursday and let you know.
Thank you for your patience.