It must be 24 hours after the examination for both you and the person you are discussing with.
Only after this time period can you start to discuss questions. After 24 hours you will have finished the exam already, hence no cheating can take place.
I said that ''we are watching' to send a message to anyone atempting to pass on info to you.
If you have not done the exam yet and you attempt to gain information regarding certain question you will be banned.