The amount of space required for a leach field can vary depending on various factors such as soil type, the size of the septic system, and local regulations. Generally, leach fields require enough space to accommodate the dispersal of treated wastewater into the soil. It is recommended to consult with a professional septic system installer or local authorities to determine the specific space requirements for your leach field based on your unique circumstances and local regulations. They will consider factors such as soil percolation rates, setback distances, and any other relevant considerations for a proper and efficient leach field installation.