The fastest turnaround time for a space shuttle was 54 days pre Challenger disaster and 88 days post Challenger disaster. It was very expensive and time consuming to reuse the space shuttle (they basically had to completely disassemble and reassemble the whole thing) which is one of the main reasons it has stopped flying. Falcon 9 on the other hand has a fastest turnaround time of 3 weeks. So not sure where you got your numbers from, but it seems to me that the Falcon 9 is a much better vehicle in terms of reuse.