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How long after eating does it take for a cat's stomach to be empty? A medication my cat needs to take suggests that it be given on an empty stomach. My cats a grazer and I don`t want to starve him (he is fed every 4 to 5 hrs, and usually takes up to 1.5 hrs each meal to finish) as he`s lost a tremendous amount of weight. So, basically I`m trying to find out how long... show more A medication my cat needs to take suggests that it be given on an empty stomach. My cats a grazer and I don`t want to starve him (he is fed every 4 to 5 hrs, and usually takes up to 1.5 hrs each meal to finish) as he`s lost a tremendous amount of weight.
  It usually takes about 4 to 6 hours for a full stomach to digest the food. However, this varies from person to person, and if vomitting occurs, much less time. It takes â¦ from 12 to 24 hours for the food to completely leave the digestive/excremetory systems.7 people found this useful.Studious Student.ow long do you have to wait after eating to have an empty stomach for taking medication to be taken on an empty stomach? If you ate for 20 minutes, wait for 3-5 hours, or if you ate for 1/2 an hour, wait for 4-6 hours. Do NOT wait two hours because there may be a risk if your digestion is in â¦ complete.