The restoration of stairs is always a bit different, and every time it requires unique techniques. The floorboards are heavily damaged, and usually, people don't take care of the stairs. That's the reason to apply something unique to this lovely house.
The stairs repair include reclaiming, light sanding, dark oak staining, and matt finishing. The final polishing process is just to seal the surface and keep it for a much longer time.
Stairs repair (in this range) usually takes 1 day.