TexAgs91 said:
Once it's fueled, it takes 2-3 days to unload and refuel it
That's not what causes the 2-3 day delay. They can safe the vehicle in about 4-5 hours after a complete propellant load. The delay is caused by the need to replenish the orbital tank farm with some liquid oxygen and mostly liquid nitrogen.
They cannot avoid boiling off about 25% of the liquid oxygen because they vent a lot of it during transfer and engine chill. They use liquid nitrogen to recondense the liquid oxygen and methane using kettle boilers. The coolant loop is open cycle that vents to atmosphere after the heat exchanger. They also use the liquid nitrogen to purge the propellant lines.
They reclaim all of the methane that doesn't leak, they reclaim all the liquid oxygen which doesn't vent, but they cannot reclaim ANY of the liquid nitrogen.
So it take a couple of days to truck in all the liquid nitrogen and LOX.