How long???
I also cheat on this. I only cheat when I am at work. My job is talking on the phone so I am always sipping and drinking when I can to keep my voice clear. When I first returned to work I tried the 30min before and after and I would start to cough and get scratchy. If I cough when talking on the phone I can get a formal warning, and get two or three of those and youre fired. So I traded cheating for my job. Also for my evening meal and on weekends I always pay attention and wait the time.