Answer: It depends largely on how big of a job it is to replace the plumbing, but in cases where only basic residential plumbing fixtures are being replaced, usually 6-12 hours.
It can be difficult to answer this question without knowing what was done to the plumbing before, but assuming that no significant construction or demolition took place then you generally have two options. You can replace all of the piping in one day by working 12+ hours with an experienced installation team, in which case you might not use any kind of chasing for joints or fittings due to its time consuming nature and potential for leaks during installation. Alternately if only some portions need replacement dependent on access points needing work you will probably remove everything from inside walls after consulting with an