We went through all of SOTW, it took us about 6 months per volume at 2-3 days a week. (we school year round)
I asked the questions from the activity books for the first 2 books and we did the mapwork. The last 2 books we just read as a read alouds. Its hard to say how much was retained. My boys didn't like how the series jumped around between countries. They like the Famous Men series a lot more, and as they got older have read a lot of historical fiction.
As far as science we have not used NOEO. We've used living learning books science when they were pre third grade. We now use a combo of textbooks from McGraw Hill as well as lots of living books for science in grade school.