Leather shoes last longer when they are cleaned of dust, conditioned now and then, and allowed to dry away from radiators. You do not need a large kit. A soft brush, a cloth, a neutral conditioner, and cedar trees (or even loosely stuffed paper) cover most weeks.
After wearing, brush the upper. If they are wet, stuff them and let them dry at room temperature. Conditioning every few weeks — not every night — keeps the leather from drying out. Use a product meant for leather shoes; avoid household oils.
We do not publish a guaranteed lifespan. Wear, weather, and storage decide that. Step-by-step notes live on the shoe care page.