Course Length vs. Assessment Length?

Hey Everyone, 

Have any of you developed a formula or have input on how long assessments should be in comparison to the length of a course? I understand each course is different and assessments vary based on the content, but I was just curious if there is a common ratio when it comes to course length vs. assessment length. ( i.e., A 20 min course typically consist of a 10 question assessment...etc.) 

Thank you in advance! 

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