Pat Bowden completed this course, spending 2 hours a week on it and found the course difficulty to be easy.
A fun course. Occasional exercises asked for daily updates for a week, but sometimes I had not even read the requirements until a day or two before the deadline. This problem could be easily fixed by rearranging the order of the videos or asking students to start working on the exercises as soon as possible.
And, yes, the exercises were helpful for increasing happiness levels, and many were designed to continue after completing the course.