it depends on the science. in college, some classes are broken down and spread over a few semesters, usually two, which would mean that it would take one academic year to complete the entire course.
if you are referring to how long it will take to complete a degree, it also depends on your major and how much you learned in high school. on average, for a bachelor's degree, it takes about four years.
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There's no such thing as "a physical science degree". Or, rather, there are any number of things that might be called a physical science degree.
In the US, it usually takes four years of study after high school to earn a Bachelor's degree.