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ASML has 32000 employees. Lithography machines are their only product. They have been working on EUV for decades. They're the only company currently able to make it today. They and Nikon are the only companies currently able to make previous gen machines.

A Chinese knockoff would also not have access to their suppliers in most cases, such as Zeiss, which are critical to the tech.

It's going to take a while.

Can you elaborate? Are they developing them now? If not how realistic is it that they could have something as sophisticated as ASML in a few years?

According to ASML, they have 4700 suppliers (https://www.asml.com/en/company/sustainability/responsible-s...). How many of those are essential to the development of EUV equipment and would be affected by this ban is unclear (though I'd expect a reasonably large percentage).

This is not realistic, though in the long term who knows