pfff depends. Usually, I would've already read 4 different news sites before the session, so CNBC in the background is enough just in case Trump says anything. I always have some sort of program backtesting my strats and theories in the background, so there's even more waiting.
I look over my trading so far during the day, look for both good and bad things I've done(very important). Now that doesn't take much for me to do, maybe an hour. By then I'll either have my stop hit or the setup has horribly changed so I cancel the stop.
I usually skip lunch, that session is basically a black hole for my money with the current strategies we're trading. We're supposed to only trade US equities, but we can get FX enabled on our accounts if we ask our manager. So yeah, during lunch i'd either be playing miniclip, watching a pirated movie, or trade forex. Bear in mind that you get very good at multitasking if you trade at prop, so it's not like I'm zoning out while I'm waiting for my stops or for the lunchtime trade to finish.
P.s. oddly enough, some of my best trades happened when I was bored to shit during lunch and turned to forex for a cathartic trading experience.