The time that it takes to get a six-pack varies for each person. Depending on current body fat percentage, it can take anywhere from weeks to years. Visible abdominal muscles, which are commonly referred to as a "six-pack," become more prominent as the body fat percentage decreases.
In men, the visibility of abdominal muscles becomes considerably more noticeable when the body fat percentage level is at or below 8 percent. In women, a body fat percentage of 13 percent or lower is usually sufficient. The abdominal muscle structure is affected by a person's genes, which means that not everyone is capable of attaining a six-pack. However, muscle size can be increased through abdominal muscle exercises. Exercises such as crunches and sit-ups help to develop the abdominal muscles.