During rocket racing several years ago, XCOR participated with a rocketplane - a plane which only has a rocket engine as the sole mean of motion. They did two b

During rocket racing several years ago, XCOR participated with a rocketplane - a plane which only has a rocket engine as the sole mean of motion. They did two back-to-back flights. Between wheels stop and wheels start they had to prepare the rocketplane for the next flight. They did that in under 9 minutes - about 20 people simultaneously working on the plane, checking and loading with pressurized gases, fuel (ethanol, I think) and oxidizer (LOX). I doubt Dragon will have turnaround in minutes. But in days, under a week - I think it's quite possible, as a routine operation.