Most full home design projects run somewhere between 4 and 12 months or more from the first consultation to final install, and the honest answer is that it depends heavily on scope and how much is custom versus in-stock.
A few things stretch or shrink that window: whether construction is involved (renovations and new construction take longer than furnishing an existing layout), how much of the furniture and materials are custom or made-to-order (which can mean months of lead time on their own), and how quickly decisions get made once options are presented.
Design development, where the actual layouts, materials, and selections get decided, usually takes the longest, since it’s where the real thinking happens. Execution, ordering, coordinating with your contractor, and installing, tends to move faster once the direction is locked, but it’s still dependent on shipping and fabrication timelines that are largely out of anyone’s control.
If you’re planning around a specific date (a move-in, an event, a sale), that’s exactly the kind of detail to bring to the discovery call early, since it changes how the whole timeline gets structured from day one.