My standard is 0-2 meals a day. Up until recently I had absolutely no structure to my eating habits, I would simply eat when I got hungry which was usually once a day in the afternoon. Now that I have a job with regular hours I tend to eat with a little more regularity, if only because the caffateria here closes around 12:30. So if I get hungry during the day I try to eat around 11:30 and will then eat dinner between 9 and 10 at night, if I end up not having lunch I will try to get around to eating something around 5 or 6.
I can go several days without eating and feel fine (obviously I wouldn’t be running and marathons, but for everyday tasks around my apartment I would be fine) (I also have never done this on purpose, its just that I will forget to eat. If I am not doing a lot it can take a few days before I get hungry enough to notice), when I do get hungry at the end of one of these extended fasts it is simply just a realizaiton that I am hungry and should probably get around to eating sometime today. I cannot recall ever being painfully hungry, even on the few occations that I went almost four days sans meals.