The systems are different. Our system is centralized, whereas in the United States there is a great diversity.
The Infectious Diseases Society of America, the IDSA, states that you only need two to four weeks of treatment. However, another group will say that things are not that clear and that you need a third option. It depends on the medical system.
I prefer the Canadian medical system, but our system recommends two to four weeks of antibiotics and that's all. There's no diversity here and everyone does what the IDSA suggests.