It takes roughly 50 min to convert three feces of any size and fifty thatch into one fertilizer according to the wiki
Use a Phiomia to make mass amounts of medium poop by feed it large amounts of Stimberries.
3 poop and 50 thatch makes one bag of fertilizer after 50 real life minutes on base rates.
Some better alternatives:
Dung beetles convert feces to fertilizer in 15 minutes.
If you make a man-made toilet poop in it and flush, it will automatically give you a bag of fertilizer.
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