Long Volumetric Video is a novel technology for reconstructing long voxel videos from multi-view RGB footage. This technique effectively models long voxel videos using a new 4D representation method called Temporal Gaussian Hierarchy, addressing the issues of high memory consumption and slow rendering speeds associated with traditional dynamic view synthesis methods when processing long videos. Key advantages of this technology include low training costs, fast rendering speeds, and minimal storage requirements, making it the first technology capable of efficiently processing minute-scale voxel video data while maintaining high-quality rendering.