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 0.02=960.03 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