What Apple needs to do is start "planning" an iPhone production facility in the United States. Finding a good location and design work will take about 18 months. Dealing with the inevitable lawsuits about its size and effect on the area its planned for another 18 months. Ground is finally broken around June 2028. Unforeseen issues at the site cause construction to deal with numerous pauses. January 20, 2029, Apple pulls the plug on the project.
Of course, if that one special Big Mac finally finds its way to that truly special aortic spot, this project might end a bit sooner.