In summary, if you are planning on getting your Life and Disability (Health) insurance producer licenses for example, plan on a lecture class running 4 full days, then study for 3-5 days thereafter, and take the state exam immediately. The point in doing this process rapidly is so that you do not forget important material that might have been emphasized by the instructor. An average length, from class time to testing, should take around 2 weeks.
If you will be self-studying online, then the window is a little wider since you might only have time to study for a few hours a day, especially if you are switching careers and are still working full-time or have a family. In this case however, it is still encouraged to hold yourself to a time frame of no more than 4 weeks to study and take the state exam.
If you have confidence in yourself and study hard, you will be able to pass the insurance producers exam and get your license in Washington State.