Explore the cutting-edge field of computational photochemistry in this 32-minute lecture by Mario Barbatti, focusing on nonadiabatic dynamics in the long timescale. Delve into the current challenges and future directions of this complex area of study, gaining insights into the latest research and methodologies employed in simulating photochemical reactions over extended time periods. Discover how advancements in this field are pushing the boundaries of our understanding of molecular behavior and paving the way for new applications in materials science, energy conversion, and beyond.