Honestly, the answer depends on whether you mean two benches sitting side by side along the same stretch of path, or two benches placed as separate rest stops on a longer trail.
If you are placing two benches right next to each other on the same side of a path, leave at least 36 to 48 inches between them. That gives people enough room to pass, turn, sit down, and stand up without feeling crowded. It also keeps the path accessible for wheelchairs, walkers, and strollers. If you have extra space, 6 to 8 feet between adjacent benches feels more comfortable and gives each bench its own small social zone.
If you mean spacing benches out along a walking route, a good rule of thumb is every 100 to 200 feet, or roughly every 30 to 60 meters. On flat, open sections you can go closer to 200 feet apart. On slopes, stairs, or areas with older adults and families, place benches closer together, around 100 feet, so people can rest when they need to.
Also pay attention to the path width. Keep at least 36 inches of clear walking space in front of any bench. If the path is narrow, set the bench back slightly or angle it away from the main walking line instead of placing it right at the edge.
The biggest mistakes are placing benches too close together, which makes one bench feel useless, or too far apart, which leaves people without a place to rest. For most situations, keep adjacent benches 3 to 6 feet apart, and space trailside benches every 100 to 200 feet for a comfortable walking experience.