CHIRLA is a novel video-based dataset for long-term person re-identification (Re-ID). Unlike previous studies that focused on short-term appearance changes, CHIRLA aims to be a robust system that handles long-term changes due to clothing and body changes. Recorded over seven months in four indoor environments and using seven cameras, CHIRLA includes 22 individuals, over five hours of video, and approximately one million bounding boxes and identification annotations. We define a benchmark protocol that encompasses diverse and challenging scenarios, such as occlusion, reappearance, and multi-camera conditions, to facilitate the development and evaluation of Re-ID algorithms that can perform reliably in long-term, real-world scenarios. The benchmark code is publicly available.