"Long (Duration)" refers to a period of time that is extended or prolonged. In various contexts, such as music or film, it indicates a piece that lasts for a significant amount of time compared to others. For example, a movie that runs for over two hours is considered long in duration. In finance, "long duration" often describes bonds or investments that have a longer time until maturity. These investments are sensitive to interest rate changes, meaning their value can fluctuate significantly over time. Understanding duration helps investors manage risk and make informed decisions about their portfolios.