I’ve used both curriculums, although I don’t know what SCM science you are thinking of using? I would say they take about the same amount of time – it’s more a matter of philosophy. MFW involves a lot of things that aren’t really CM in teaching style. I really enjoy their format and focus, though, so I would say you could adjust some things in their program to make it more CM friendly. Either program will take you about 4 hours per day total. You can add to that if you desire with your independent reading selections.