How long should an animal be on antibiotics?

I'm curious, could you elaborate on the recommended duration for administering antibiotics to animals? Is there a general guideline or does it vary depending on the specific type of antibiotic, the animal's health condition, and the nature of the infection being treated? It's important to ensure proper dosage and timing to effectively eliminate the illness while minimizing any potential side effects. So, how does one determine the optimal length of time for antibiotic treatment in animals?