Is the study schedule broken?

I put in a twelve week window with 20 hours and it reverts back to 68.44 hours per week. That's mind-boggling. I can't study for that long every week, I have a job. How can you make it so gives you a twelve week plan @ 20 hours per week? If someone could guide me that would be great. I want to upgrade to the Ultimate+ version but this is holding me back. If that doesn't work could someone email me a screenshot of their 12week 20hour plan? Thanks.