generally once just after breakfast, sometimes one more time in the afternoon.
Time of day really is going to vary with your routine. I once had a really lousy job that started at 3 in the afternoon, and my whole cycle changed so that I started crapping at 2:30. Maybe some basic animal instinct: you know, clear the body for action before going into the fight.
As for urination, that depends on how much water I drink (a lot) and how much exercise I get. I eat a full breakfast with cantalope (lot of water), tea, and grapefruit juice, then go to class for three hours. On mornings when I drive school, I have to urinate twice during the morning. On mornings when I bicycle -- part of the route goes up a long, wicked slope -- I don't urinate at all; most of the extra moisture goes out through the skin as sweat during the bike ride.
Wake up once each night to piss. When I was younger I always slept straight through and had to run to the bathroom as soon as I got up.
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