They can be related to the NonStock flag.
Here is a screenshot of an old spreadsheet, it’s pretty old but I think it’s still valid.
Should get you in the ballpark at least.
When I was starting out, I used a Test system first. Where I made some stock/nonstart parts and simple methods for each type, then ran MRP. Note that the overall build time can vary A LOT depending on how part masters and methods are setup. Lead times, MFG Lead TIme, Phantoms too…
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