Maybe they have a bathroom schedule like on the Big Bang Theory. But normal is, regardless of the frequency, you go when nature calls. If you suddenly are going 10 times a day, then it is time to go and see a doctor.
Why the hell do you even care, or take time to notice? I'm sure twice a day is normal for some and a bit much for others but I cant believe you are studying this. Pics and a sample or it didn't happen.
Yeah. My bowels are super healthy so double or triple poop is not unusual. I got tired of my roommate tracking it so I put a camp-toilet in my room and toss it out the window; is that weird?
Healthy pooping frequency varies quite a bit from person to person. Twice is day is normal for some, for others the only go once every couple of days or so.