How many years does it take to study Biology? What is the salary range for a biologist?

Generally four years for a bachelors degree, another two for your masters, and another two on top of that for your doctorate. As for salary it depends on the career track you take. You could end up working on any thing from forest ecology with the national parks to astro-biology research at a university. With a degree in a in biology the world is your bivalved mulusk (oyster).