While you can upload a course that is just 5 videos with no actual video and 30 minutes of content, I wouldn't expect it to sell well. Putting in the bare minimum effort on Udemy generally doesn't pay off when you're competing with other instructors in the same topic who are willing to produce a more comprehensive offering. If you're just doing this to practice and get something out the door, that's cool. But if your goal is to have an impact with this course, I'd advise making it more comprehensive. People can get 30 minute videos for free on YouTube; they rarely pay for them. Study the existing courses on Udemy in your topic, and ask how yours can be better than that.
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