I don't go places. That's why I can run so many Tamagotchis. I don't go to school or hang out with other people or work or anything. I just sit around in my room, and when I DO go out (to the grocery store) I take all my Tamagotchis and check them frequently.
XD I'm jealous of you, EMF! I would run so many Tamas if I could do that.
I usually run three at a time. I've tried more than that, and it was a diasaster, to say the least. They ended up sick, and I was pulling my hair out. It wasn't exactly my idea of fun, so I went back to three. It's just enough to keep me entertained without losing it.
I also always run my v4 and v4.5 together, since they're so similar. It's different enough to make it interesting, yet similar enough to compare the two.