In reality there is many different answer to this question. But, there is only right one. Technically if you have the right company working for you. It should only take 5-6 working days over a period of 2-2 ½ weeks depending on what materials are selected. I have heard clients tell us that they were told 3-4 weeks up to 2 months to do a kitchen. How this is possible unless the company was not focused on giving you the very best serve he or she could possibly. And it truly breaks our heart to see clients get railroaded every time by these type or retail firms and contractors.
The key is you need a very detailed team that is organized. That organization and detail will then carry over from the sale of your project to the installation and completion of it. Management of teams are must and having all materials to do your project before starting the project is just truly an ethical requirement for us. Be careful with the timelines of your projects. The right team, and staffed correctly will amaze you on all levels.