Also I wonder how long the keyboard lasts and how does one replace it.

Can't say how long the keyboard will last since it's only been out for a few months, but I expect a long time as these are their new (now old) magic keyboards.

As for replacement, the keyboard is comes out as a module, so it just takes about 10-15 minutes of disassembling and putting a new keyboard in. Macbook Neo is one of Apple's best repairable laptops.