Someone did the homework on the time that it takes (Japan does it in 5 years): https://www.sustainabilitybynumbers.com/p/nuclear-constructi...

One observation is that Small Modular Reactors could take much less time: https://www.sustainabilitybynumbers.com/i/111356564/modular-...

Edited to add: China estimates 10 new reactors at 27 billion in total: https://www.reuters.com/sustainability/boards-policy-regulat...