I assume you are doing this next to your job. So about 2 weeks, 1.5 hours per day. You can also do it faster or slower, depending on how you plan it. You decide for yourself. You will have life-long access.
You can listen to the resume in your car or during exercise via the audio (Module 1: 18 minutes. Module 2: 1 hour and 10 minutes). The workbook for module 1 has 10 assignments. The workbook for module 2 has 13 assignments. It helps you to go from ‘knowing how to do it’ to ‘actually doing it the right way’. Completing the assignments in order to be able to formulate your proposal properly, takes up most of your time. You will reap the greatest achievements if you give it your full attention.
You can start convincing Americans quickly and improve over time.