Has anybody ever had a stool sample?

There are two types of stool test: faecal occult blood test and stool culture. The occult blood test detects if there is any blood, usually used as screening tool for bowel cancer for older aged men and women. The one that you most likely got was a stool culture which looks for pathogen and bacteria that may be causing your digestive problem. It usually takes 2-3 days but mine this year took 4 days.

It can take a week or more in the U.K.

Your doctor asks you questions, such as, “How long have you been sick? ... It can happen anywhere, to anyone, and from foods we might not expect. ... Testing the stool sample is important to track the “who, what, when, where

Stool samples can detect a wide range of things -- depends what they are testing for. (Surely your doctor told you exactly what they were looking for.)

The doctor would also have told you when to expect results.