If you have product-market fit, then you can build the marketing assets quickly. Otherwise, it depends on the skills of the team, but the fastest you can build requires you to build a sales letter in a day, publish the funnel in a day, build the VSL and run ads. The fastest you can get to the starting point is 3 days of non-stop work. If you are starting from scratch, it will take you 2 weeks to build. Launching the ads will take you a day. The most difficult step is product-market fit.