I eat at the speed of light (or so I think). I could finish my food in 10 minutes, 15 if I drag. Not that I am proud of it - it frequently causes indigestion and sometimes make me look like a boor. I picked up the habit after conscription, when usually we just have 15 minutes to finish lunch or dinner.
In contrast, my friend is a slow eater. He chews his food carefully, swallow slowly and never talked while chewing, which means that he never chews while he talks, and if we are talking, it would take forever for him to finish. I on the other hand while say one sentence, eat a chunk of food, then another sentence, while he would have an entire conservation without touching his food.