You will need to figure out the formulas for consumption rates. I think they may already be close somewhat, but they definitely aren't perfect from what I recall. The cast time setting on the food/drink is related to the interval between when you can eat or drink again, but you would need to do testing to figure out the exact numbers.
It would be nice to figure out the alcohol tolerance formula, as that can get out of sync with the server too which can cause the client and server inventories to lose sync which can cause item loss. I have just never had enough time and will to run all of the tests needed to get decent formulas.
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