This macro will save you a few seconds when extracting masks. It basically extracts a mask at 0 thickness, cleans it, polish the result and zremesh it at 1k by default. It is up to you to do more zremesh and add thickness with Zmodeler if you want.
Copy to : C:\Program Files\Pixologic\ZBrush 2020\ZStartup\Macros\Misc
In Zbrush , go to Macros and click "Reload all Macros". You should see the button "Extractor"