It will take 42 days for the
Large Hadron Collider
to provide us with the
Answer to Life, the Universe, and Everything.
Between the official inauguration of the LHC on September 10, 2008 and the first high-energy collisions experiment on October 21, 2008 are 42 days*.
*Including the first and the last day.
BTW: How many hadrons can fit in a row?