I usually take lunch around noon, but sometimes it runs later if I'm busy. If I take lunch later than 1:30pm or so, I get cranky because I need food in my belly.
I usually bring my own lunch and eat in our little dinette area with the door closed so no one bothers me, but I usually end up bothered anyway. If I go out and about, I will eat in my car parked around the corner in an abandoned shopping mall area to be alone. I am usually always on my phone/ipod and often times both.