The **service life** of fiber cement board typically ranges from **30 to 50 years**, depending on several factors, including the quality of the material, installation, and environmental conditions. In some cases, when properly installed and maintained, fiber cement boards can even last longer than 50 years.

### Factors Influencing the Service Life:
1. **Material Quality**: High-quality fiber cement boards, made with premium raw materials and modern manufacturing techniques, tend to last longer.
2. **Installation**: Proper installation is crucial for maximizing the lifespan of fiber cement boards. Incorrect installation can lead to issues like water infiltration or cracking, which may shorten the board’s life.
3. **Environmental Conditions**: While fiber cement is resistant to weather extremes, very harsh conditions such as consistent exposure to saltwater (coastal areas) or freezing cycles may reduce its lifespan slightly.
4. **Maintenance**: Fiber cement boards are low maintenance, but periodic inspections and minor maintenance (like repainting or sealing) can help extend their service life. Keeping the surface clean and addressing any potential water or moisture issues will also ensure a longer life.

With its inherent durability and resistance to moisture, fire, insects, and decay, fiber cement board is considered one of the most long-lasting siding and cladding materials available for construction.