I started with some home made broth from boiling a rotisserie chicken carcass. Some of the chicken meat was returned to the soup. I put raw onions/celery right into the broth. That sat on the stove for about 3hrs. It was plenty hot enough to cook the veggies. Other veggies(corn, canned beans, whatever you like) and chicken were added shortly before eating. So, maybe 4 hrs in total.
