How long did it take Piltdown to be denounced? How many Lamarckian drawings are still being touted as evidence for evolution? Too long and too many, as far as pure science goes.
Have you ever checked into how the Piltdown evidence was received and published by the "scientific" community?
Late 1912 would be among the earliest. Of course, German and French scientists didn't think much of Piltdown; English scientist like it (sort of an "Out Of England" movement.) The British Museum didn't allow the bones to be examined for some years for some reason (I don't know why) so it was harder to find out what was actually going on.
No Creationists worked on proving a hoax. That was done by scientists using scientific methods.
What is the Creationists evidence that Piltdown was a fake? Scientific evidence is based on radioactive dating and the fact that Piltdown doesn't fit evolutionary theory.