You have to give a contractor between 3-5 days to present you with an accurate proposal, unless you can tell them exactly what you want for all your finishes, cabinets, tile, granite, door pulls, backsplash tile, lighting, crown moldings, etc, etc.
I’m not sure if somebody came back to me in 24 hrs with a price, I would hire that company.
I always tell people they will have the proposal in 3-5 days.
with all respect, the problems that arise at the end of these type of projects are usually because people did not factor in all the small things at the end, that take 2 or 3 days of manpower to complete.