I'm no poopologist, but I'll give it a shot!

Your output, is incredibly, incredibly, incredibly, dependent on your input.

People who eat a strict carnivore diet, famously, have very little and infrequent poops.

People who have a fiber-rich diet, and eat spicy food, think about curries, have frequent and powerful poops.

People who eat a lot of fat, more fat than they can process, will have more fatty poops. In fact, this is one way to determine if you are eating enough fat in your diet, if your poop is dry and clumpy, you need more fat. If your poop is fatty, you need less fat

All of this is also moderated by your gut biome, whether it's changing or fed. If you make any serious diet changes, you can expect an odd pooping schedule for the first week or two. Until your gut biome completely adjusts. I've seen a paper where it indicates total gut biome adjustment to a radically new diet can take up to 9 months

A lot of modern processed food, in order to try to be "healthier", is difficult, or not impossible, for the body to process. That means it goes from the input to the output very quickly. Lower transit time, is healthier because you're absorbing less of the nutrients when you're eating a bad diet, but it means more poop

On the whole: fat, and protein, are almost totally absorbed by the stomach. Grains, carbohydrates, fiber, anything from a plant, The domain of the intestine... And since these are not perfectly absorbed, they have more outputs.

Fun fact, poop is brownish, because that is your old blood cells getting removed!!!

Everything from 3 times a day to once every 3 days is normal. It depends on how much you eat, how much of it your body can absorb, your fiber intake and some genetic variance too.

Your intestines aren't a conveyor belt, things don't constantly move. There are multiple muscles acting as a valve between different sections. Based on the factors above your body decides when to push stuff to the next section including the exit.

Speak for yourself. I've pooped three times before I'm even out of the house.

...You poop only once?

Who is "we"? Speak for yourself, I usually poop after most meals; if I've eaten a lot or very spicy or fatty things, I might even poop more than once for the same meal.

Yes, your colon is a poop buffer.

I don't usually eat more than once or maybe twice a day but often still take more than one shit.

Everyone's bowels are bitty different.

Cuz we're generally more full of shit than we like to admit.

Maybe you poop only once. Everything between three times a day and every three days is in the normal range. If you find yourself within this range, congratulations, you are a boring pooper.

How much you poop is going to vary based both on your body and your diet. Ive read anywhere from 3 times a day to once every 3 days can be normal.

no poop knife for this guy, amiright?!

The rectum is considerably larger than your mouth, and can hold a lot more shit.

Once a day? You're not eating enough fiber.

Once a day? Hahahaha

That would save me a lot of time!

I'm 2-3 times a day. it was 5+ until we figured out my body hates gluten

Humans have a really good digestive tract for getting nutrients out of food. So you take a lot of the mass of the food you eat and use it in your body as energy or building material. As such your poop has significantly smaller mass because it's made up of all the stuff you're body can't use after it's pulled out so the good bits.

As for dogs my understanding is they have a shorter digestive tract to allow them to eat the nasty stuff does seem to like without getting sick so they are probably less efficient at removing nutrients and poop more proportionally to what they eat.

Maybe you poop only once.