How fast does filling go away?
A full stomach (either food or drink) empties completely in 30 minutes. This is a continuous process that begins as soon as you’ve eaten an item, and has no connection to the buff duration. So if you start with an empty stomach and eat only a 20 Filling food, your food bar will show about 1/5th full, and will be completely empty again in 30 * 0.20 = 6 minutes. In general, you digest 3.3 points of filling per minute. There is an issue with digestion right now, either a bug or a poorly communicated design change. From testing done by several chefs it appears that the time to go from 100% to 0% is 45m, not 30. The original plan was 60m, so we’re not that bad off. But keep this in mind if you’re not able to eat as fast as you think you should given the 30m calculation.