You dont get many 5 day refurbs, that imo would be a rushed job, as im a sole trader I usually take two weeks depending on the size of the job.
I know 5 days for a refurb isn't much time, but then again some small bathrooms don't take too long, depending on what needs doing, I was just using it as an example! Because we all know pricing jobs can be so varied, I was just roughly making the point on how you go about quoting jobs, day rate x the amount of days roughly the job will take! Obviously materials + 20%.