How long did it take humans to come up with the amazing things they did? How many endless eons? How many countless iterations and generations must it have taken to make them, long before there were even amazing or ancient technologies that themselves had to be made?
Sometimes this line of questioning is used to support the long, stretched-out, taffy-pull called evolution, that prefers to spread everything out, including time, until it is so thin in the middle it breaks.
But my answer to “how long?” would be: It took humans about as long as it takes just one person to figure out that the thing he mosts fears contains that which is most life-giving. It takes a twinkling of an eye. This is summed up, symbolized, and incarnated in the man Jesus Christ. The savior who called himself the serpent.