A 720-hour course is way too long I believe. I am not sure, but I would guess that average course length on Udemy would be about 12 hours. I have seen a few Digital Marketing and Coding courses run for 50-70 hours. So, if you can compartmentalize your courses into blocks of 50 hours each, I think that would be a good start. The tricky part here will be to bring every course to a logical end, and to start every course from a logical beginning that would make sense to the users even if they have not gone through the previous courses. Else, you can name the courses as part-I, part-II and so on. Every course must have a great course intro video, that is designed to persuade learners to join in. Also, this is very important. Sales is mostly topic driven. A great course on Machine learning will generate huge sales, while a super-great course on an obscure topic may not generate sales. So, if you can sell your content on the topic that already has a big student base on Udemy, that will be great. You will find stats on the popularity of topics inside Udemy's marketplace insights.
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