Shipping containers are faster to use for building because they are pre-fabricated structures that are already designed, engineered, and manufactured in a factory setting. This means that they can be easily transported to a construction site and assembled in a relatively short amount of time.

Here are some reasons why using shipping containers can result in faster construction times:

1. Minimal site preparation: Shipping containers require minimal site preparation as they can be placed on a level surface and secured using a foundation such as a concrete slab or piers. This means that there is no need for extensive excavation, grading, or other site preparation work.
2. Modular construction: Shipping containers are modular in design, which means that they can be easily stacked and connected to create larger structures. This allows for faster construction as multiple containers can be assembled simultaneously.
3. Simplified construction process: Shipping containers are pre-fabricated structures that come with pre-installed walls, floors, and ceilings. This simplifies the construction process as there is no need for on-site fabrication, cutting, or welding.
4. Efficient assembly: Shipping containers are designed for efficient assembly, with standard sizes and components that can be easily transported and connected on-site. This allows for faster construction times, especially when compared to traditional building materials that require on-site customization and installation.

Overall, the pre-fabricated and modular nature of shipping containers allows for faster construction times and reduced construction costs, making them an attractive option for many construction projects.