Worlds Most powerful Diesel engine - wear rate

I sure by now most of us have looked at /
I was looking at some documentation on the engine builders site and
came across this: ". The cylinder liner wear rates are in the region of 0.020.03 mm/ 1000 hours maximum."
in the document:
That equates to about 1 thou in 42 days - I don't now much about internal combustion engines but that seems quite high. Is it because of the large bore of the cylinders that the rings can cope with a relatively large amount of cylinder and ring wear ?
Regards Tim
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