the câu hỏi is for the smart peoples so....

hi guys give me an advise how many hours should i be on net hoặc fanpop in school time im so afraid that this fanpop make my degrees down. in summer time i often 2-5 hours on net but in school ipalned for 1 to 2 giờ what do u think plz give me an answer 8 các điểm thưởng for best advise .thnx