Stage velocity is the pace a deal moves from one stage to another in a sales pipeline. It is a measure of how quickly and efficiently a sales representative can move an opportunity from the initial contact to the final close. Stage velocity can help the sales representative to forecast more accurately, identify and remove any bottlenecks or obstacles, and optimize their sales process. The number of stages an opportunity must go through or the average length of a customer's contract are not the correct definitions of stage velocity, although they may affect it. The number of stages may vary depending on the complexity and size of the deal, and the average length of a customer's contract may depend on the type and value of the solution. Reference: Certification - Sales Representative - Trailhead, [Sales Rep Training: Create Effective Selling Habits - Trailhead]