What we have tried to do over the last few years is to teach the language based on age groups, profession & their current level. Language teaching is a subjective matter and requires an organic approach for individual groups that might not fit for others.  The interpretation of “Complete IELTS in One Go” is that it is an attempt to support those individuals who are seriously running out of time for some reason and want to “complete the IELTS syllabus” at least once in one sitting – so that they don’t need to spend 2-3 months to complete its syllabus. Well, many IELTS aspirants have been preparing for the exam for ages now – they don’t have any justification except they are either less serious or they don’t get time to do it. When you attend the “Complete IELTS in one go” session, you are not only getting a blueprint for IELTS but also creating content collaboratively, for each module – besides feedback on individual performance. So let’s say, when you get a blueprint of IELTS preparation, create content, and receive feedback on your performance and if these inputs set the stage for you, I think 17 hours is justified.