Is it permissible to combine prayers during university days due to the long distance and shortage of time?

Prayer must be performed at its legally appointed time. Delaying it is a grave sin, and Allah has promised severe torment to those who abandon it, as stated in His Almighty قول: {So woe to those who pray [But] who are heedless of their prayer} and His قول: {Then, there succeeded them a generation who neglected prayers and pursued desires; so they are going to meet evil}. It is not permissible to use studies or anything else as an excuse to delay prayer. Combining all prayers upon returning home is not permissible. The permissible combination is between Dhuhr and Asr, or Maghrib and Isha, either by advancing or delaying, and that is in specific cases. Your situation does not necessitate a permissible combination, and the mentioned distance is not a travel distance. So, pray each prayer at its time, wherever you are, for the Prophet, peace and blessings be upon him, said: "And the earth has been made for me a place of prostration and a means of purification."