NASA began building a spaceship to travel to the moon in earnest in 1961. They successfully landed it 8 years later, in 1969. The Russians decided to launch a satellite into orbit some time in the...
few .
it took 3 years and 2 moths or 3 moths.=D
Average time 2 to 10 years 4 years idiot! >(
hs2 will take 15 years to build