This is how we've been doing math at our house lately.
DD12 (7th grade) is using just Life of Fred. She is finishing up Decimals & Percents, and then will move into the pre-algebra books. I plan to have her do a placement test from another program, like Math Mammoth, just to make sure there are no gaps before she moves onto pre-algebra. She generally does one lesson per day, four days per week.
DS10 (5th grade) is using Teaching Textbooks 5 along with the Life of Fred Intermediate Series. He just began "Kidneys" and usually does 3 chapters per week. Using just Life of Fred tends to frustrate him; he does better with more direct explanations and more practice. He generally does 1-2 lessons, four days per week, or whatever he can get to in 25-30 minutes.
DS8 (3rd grade) is using Math Mammoth 3 along with the Life of Fred elementary series. I found it difficult to use just LOF with him because we wanted to start at the beginning, with Apples, which was way too easy for him. He and I read about three chapters of LOF each week. He is doing well with Math Mammoth-especially with our simplification techniques. He also enjoys playing the online games that are linked to within each MM chapter.
DD5 (Kindergarten) is using Singapore Essentials, which I just reviewed here. I plan to start Life of Fred: Apples with her once she turns 6.
The older version of math at our house is here.