It depends on the person but a few weeks to about a month.
The answer to this question is: 20%
These demographic of students are the mixture of the students who want to focus themselves on the study, have some sort of medical illness that prevent them to do so, or the students that simply have a general personality that do not find being around alcohol and social situation very pleasant.
Onion rings from burger king = 417 calories, french fries from burger king = 280 (this is for 100g servings)
No i dont think so precautions are needed sometimes