In this blog post, Karl E. Wiegers tries to answer the question: How long will it take to “do requirements” on your software project? The answer is naturally: it depends! The post lists conditions that can accelerate requirements development and other factors that lengthen the time needed for effective requirements development. Things are also different if you use a traditional project approach or if you follow an incremental and iterative framework like Scrum. You should also examines the tasks that the business analysts will actually perform and how long those tasks will take. All this should improve your ability to estimate the requirements development effort needed for future projects.
