I wish folk would move away from the world war two nostalgia, it's debilitating and wasn't at all hard and fast, even if a 90 minute movie cut leads you to believe that.
People keep bringing up examples of going fast because others are saying "we are going as fast as we can."
The operation was completed in that time but many of the plans were created years earlier and much of the preparation (like ships/planes/manpower) was done decades earlier.