If you are looking for a degree that will train you in a general area of the field, you may want to consider getting second bachelor's degree. If you are looking for a degree that will allow you to deeply and independently explore a specific interest area in the field, then a master's degree is a good choice. Others take 5 years. In extreme cases where students have extensive activities or careers outside of the university it can take as long as 7 years. The program requires 30 units of coursework which can be completed in as little as two semesters.
Most students complete the coursework in a relatively short time.
Preparation of a thesis or project requires a large commitment of time. Once the coursework is completed many students begin career positions and finish their thesis or project while they are working. First, you will have a very deep knowledge of a specific aspect of the field. In fact, you will considered an expert in your specific chosen area. Second, you will know the process of research and problem solving.