How long did it take to form the moon?

It depends on how fast the craft is travelling, and whether there are humans onboard. The slowest ever journey to the moon was by the ESA SMART-1 lunar probe, which took 1 year, 1 month and 2 weeks.

Apollo 11, the first manned flight to the Moon, took 3 days, 3 hours and 49 minutes to reach lunar orbit.

The fastest trip took 8 hours and 35 minutes, and was achieved by NASA's New Horizons Pluto mission.