Well it depends... Normally VAC bans you in around 2 weeks...
Low gravity and stuff like that is not yet bannable... Modded servers aren't bannable yet so have fun hosting them, though i wouldnt do any XP kind of things cause people get mad and picky about that...
Or just listen to an advanced member....
(P.s) I take it your an mmo wned member? Tigermisu?