My patron saint of the lunch break is T.M. Shine. In his Timeline column, he habitually writes, "12:07 p.m. Went to lunch. Ate alone." And he brings his lunch from home, usually, and eats by the river in Ft. Lauderdale. He also gave me this valuable tip: If you're going to stretch your lunch hour, it's much wiser to leave early than to come back late. People don't usually notice if you leave early.
Now, once a week when I take my walk at lunchtime, I pass by the City Link dispenser and I stop, take out the paper (it's free) and read Shine's Timeline column. Then I put the paper back and continue my walk. Alone.