the 질문 is for the smart peoples so....

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