In theory, the SpaceX Falcon 9 v1.1 booster can be reused more than three-dozen times.
That's because the rocket's LOX/Kerosene Merlin 1D engine -- nine of which power its first stage -- have a cycle of 40, according to Stella Guillen, SpaceX director of business development.
"It's not obviously the entire system or the entire stage," she said during a space conference in Paris last month. “We don't know how many times we can fly the first stage. But the engines have a cycle of 40...
Via Chuck Black