I am currently undergoing one of my periodic healthy eating frenzies. I do this with some regularity every couple of years. This time I'm back on the macrobiotic diet, which is basically seasonal, whole foods and lots of whole grains. I plan to do this for a couple of months as a dietary tune up. Perhaps it will do me good, or perhaps not, but it does make me feel virtuous, at least.
I bring this up because I find it impossible to make just a little bit of rice at a time. I make enough rice, or millet, or lentils to feed an army, then end up with a pot full of ... well, pottage, which I keep adding something to every night, like carrots, or a tablespoon of peanut butter, or toasted sunflower seeds, any handy vegetable, herb, green I have on hand. My last mess of rice and lentils lasted a week in its various incarnations.
This is the way people in Europe ate for centuries. The lady of the cottage kept a cauldron hanging on an iron swivel arm by the fireplace, simmering at all times. Her son would bring in a rabbit, or she'd find some wild onions or herbs, or pull up a turnip, and into the pot it would go, along with a cup of dried beans, or a handful of barley.
There wasn't necessarily a set mealtime. The hungry family member would come in and scoop up a bowlful whenever he felt like it. A simmering cauldron full of a hearty soup/stew and some nice crusty flatbread baked up fresh on a flat stone by the fire any time you want it - now, that's convenience!