Modern Day Ancient Monuments Restoration; Cost and time to restore?

In a hypothetical scenario, ignoring the laws and opinions of the UNESCO, how much time and money would it take, to restore or recreate these monuments to a pristine conditions, based off its glory days?
  • Great Pyramid of Giza
  • Great Wall of China
  • Sphinx
  • Colosseum
  • Parthenon
  • Angkor Wat
  • Great Zimbabwe
  • Kilwa Kisiwani
  • Great Statue of Zeus
  • Colossus of Rhodes
  • Hanging Gardens of Babylon (In this case, CREATE)
  • Great Lighthouse of Alexandria
  • Moai of Easter Island
  • ETC, anything else you can think of
(If you're wondering how would they know what they look like in the past, they'll just use 3D modeling of those monuments as a model to recreate or restore them.)

So, ignoring the fact that a lot of laws this breaking, and the numerous protests from people, how much money and time would it take to restore or recreate these monuments?
 
There's a replica of the Parthenon in Nashville. The Hanging Gardens might make a popular beer garden. But reproducing the copper plating on the pyramids- ka-ching!
 
Alongside the enormous amount of money that would be spent in restoring such ancient monuments, it would be a longer time span for such projects; add to that was the consistent presence of watchdogs because of, well, corruption tendencies.
 
Do not do this! Build Replicas, yes, use ancient techniques to explore the methodology and engineering, Yes. Destroy the original artifact by trying to restore it to as new, No! No! No!
 
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