Not too easy. Not too difficult.
Its an online class so you need some independence and time management skills. The online video lectures aren't amazing though its good for dyslexics.
A review of middle school/high school science (except chemistry and physics) I learned some new stuff, but a lot of it is familiar science facts from middle/high school. I also learned how to do a UW online course.
Hours per week:
Advice for students:
Just read the book, lectures are not amazing though. About 20%-40% of exam questions come from past exams in Autumn 2015, and anything after all. So the minimum score you should get (assuming you didn't study any minute) is about 30%. Don't worry, Harrison posts past exams online. YOU ONLY NEED TO DO 2 DISCUSSIONS. Do more than that only to boost your score (top 2 discussion scores are counted, rest are dropped form your grade calculation). Online quizzes are a joke, they aren't even timed.