Re: The maths don't add up...
"False assumptions a fuckup make" as the saying goes.
30 minutes of break means whole pipeline is lost and it's easily a day long. Then additionally few days to clean up the mess of the half-baked, totally unusable rubbish in the pipeline.
In process manufacturing breaks are not allowed, experience from a paper mill. If that stops just like that it takes more than a week just to clean it up for a new start. Then another week to start it up.
Frankly, only 11% is impressive: This is nothing like a car factory where you can stop for 30 minutes and continue like nothing happened (even there painting would fail leading to cleanup and repaint).