The short answer
There is no single timeline. The process can change with factory scheduling, financing, land preparation, permits, utilities, delivery, installation, inspections, and weather.
Get a project-specific estimate
Ask for the current factory lead time and build a separate schedule for the property work. Do not make a move-out or lease decision based on a general estimate alone.
Track the milestones separately
Ask for the expected factory completion, site-ready date, delivery window, installation work, utility connections, and final approvals. These are separate milestones. A home can be finished at the factory while the property is still waiting on other work.
Identify who will give you an update at each stage and what must happen before the next crew can start. Before ending a lease or booking a move, confirm the home is actually ready for occupancy rather than relying only on its delivery date.