15 minutes...like swimming..jk
i've never waited...with a 30 minute lunch break, ya gatta be fast...sometimes a sandwich in one hand and a joint in the other....the important thing is not to smoke right BEFOR you eat, or you might bite your finger
sometimes if i overeat i'll smoke right away and it will usually curb that overstuffed feeling but the stone isn't as good. other than that i don't usually smoke after eating unless it just happens to pop up.