13⅜″ casing milling

Hello Community,
We are currently looking at options to abandon a well here in Angola and one of them involves cutting and pulling 13⅜" casing inside the previous casing (20") and then milling 300m of the 13⅜" casing stump in openhole.
Does anyone have experience in this? What I'm looking for mostly is average milling ROPs, average mill life and major risks. Anything would be appreciated.
It's 13⅜" 72ppf T95 W523 casing run inside 17" hole.

Cheers
Patricio

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