[omegant]

Are that engines reusable in a short time? or must they go through a mayor refurbishment after each flight?

[deletes]

Basically it is just refuel. The entire rocket is reusable. Musk mentioned in some interview it would take a couple of days.

[hughes]

Impressively, he actually said "single digit hours" between flights for the lower stages. See "turnaround time": http://www.popularmechanics.com/science/space/rockets/elon-m...

[Florin_Andrei]

"Like re-fueling your car" - he uses that analogy a lot. It's probably not exactly like that, but it gives an idea what the real goal is.