Homemade soup can sit out at room temperature for up to 2 hours.
If you're not gonna eat the homemade soup though within 1 hour it's best to refrigerate it to keep any bacteria from growing in the homemade soup.
But it's safe to leave homemade soups out at room temperature for up to 2 hours.
After 2 hours of the homemade soup sitting out at room temperature the homemade soup can grow bacteria that could make you sick.
You could get food poisoning or botulism from the homemade soup so make sure you eat the soup, keep it hot or refrigerate the soup.
If you want to keep the homemade soup out longer than a few hours you can keep the homemade soup warming in a crock pot.
I keep homemade soup warm in a crock pot for up to 3 days when I make a lo of it and then eat it and it's always warm which keeps the bacteria out of the homemade soup.