If you didn't notice Riot is having a promotion for something or something.. WHO CARES FREE STUFF
OCE:
http://oce.leagueoflegends.com/node/13080
EUW/EUNE:
http://forums.euw.leagueoflegends.com/board/showthread.php?p=15167835
Yea that's not too bad, personally I take breaks every 3 hours to be safer, but I don't think it's necessary.
(Sorry for late reply, am writing an essay)
This is botting for 150 to 210 minutes, then breaking for 27 to 43 minutes
Hope you understand that deviation is just could be longer or shorter then set time