How long did it take?

I don't know why, but lately I've been pondering the fall of man in Genesis
3. I've been wondering how long it took. How long after God said not to
eat the fruit of the tree of the knowledge of good and evil did the serpent
show up? Was it immediate? An hour later? Days? Months? Adam had time
to give names to all of the animals, so there must have been some time
elapsed. I suppose it doesn't really make much of a difference, sin still
entered the world, but just how long did it take?