Piotr is taking four classes this term, for a total of 12 cr…

Piotr is taking four classes this term, for a total of 12 credit hours. He wants to get a part-time job as well but is determined to put his academics first. In order to know how many hours he has available to work, Piotr decides to estimate how much time he should set aside each week to study. Piotr should spend at least __________ hours studying each week.