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Might take more than a century for water-engine. We're finally re-discovering mathematics China had several thousand years ago and was lost through various revolutions. Greeks and Egyptians had batteries, etc.
Even following scientific method of evidence and repeatability, it will take a long time for new ideas to be accepted. Hundreds of years for Copernican heliocentric model to be accepted. Over hundred years since Darwism, and a lot of people still don't accept it (mostly due to improper translation and interpretation of ancient history books). Just because their ideas weren't accepted at their time does not make Corpernicus or Darwin wrong.
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