If you used CPO Life Science... in Logic Stage & Middle Grade Challenges Posted Tuesday at 08:06 PM · Report reply How did you schedule it? Looking at the teacher's manual, it recommends 185 45-minute lessons. I had originally planned to schedule science for two 90-minute chunks of time each week, over 36-40 weeks. To be honest, we (I) have had a hard time getting science done this year, so I was also considering starting it over the summer, when DH is home and we don't have anything else scheduled except twice-a-week swim lessons at the city lake. This is for an 5th grader who is math-y and has excellent reading comprehension, if that makes a difference. My other option is just letting him read science books and follow the WTM recommendations for outlining, etc, but I think a textbook might keep me from letting it slide again.