Hi and thank you for your question! Most people digest foods from 24 to 72 hours so approximately 1 to 3 days. It depends on a few things such as the person and how healthy they are.

Let's start with what a doughnut is, a doughnut is made up of simple carbohydrates which are digested pretty fast in our bodies compared to more complex carbohydrates or proteins (meat). The body digests certain foods faster than others for example: it is easier to digest some chocolate rather than some nuts.

The body takes in carbohydrates and breaks down into simpler molecules and travels down. Once it's in the stomach, and then it moves down into the small intestine.

After eating, it takes about 6-8 hours for food to pass through the stomach and small intestine. Once there, it moves to the large intestine for more digestion and then elimination of residue happens after 24 hours, but complete elimination of the food, or doughnut in this case, may take several days. Carbohydrates tend to spend the least time in the stomach and so I think out of all the foods, doughnuts would be digested pretty quickly compared to say, a steak. It will definitely not take 10 days though, a good guess would be the 24-72 hours.

You would digest and absorb all of the nutrients in a donut in less than a day. What you would then do with the nutrients and how long that would take might take longer.

It should not typically take 10 days to digest a donut. A donut is a bread-like food that should be easy for the stomach and intestines to digest. It takes maybe an hour to go through the stomach, and then a few hours in the small intestine. Food generally takes long in the large intestine and may be about a day.