It all depends on how much you're smoking obviously. The more you smoke, the more your going to look stoned, and the longer it will last. The best thing you can do is get some eyedrops to take away the red eye, and if they say anything, do what calhoun did and say you're tired.
"We want weed, weed, sticky green trees, pick out the stalks no stick and no seed. We stay lean off this THC, 9 ounce to the bar four bars to the Ki"