That really doesn't seem like a lot of time for them to respond. Especially given that for 10 or so of those hours, people are probably at home, asleep, or with their families.
The rest of us are generally ignored, so we have to pick up scraps from the chosen few.
Obviously the big titles get more attention than small ones -- nobody has an infinite supply of time -- but companies like Google, Microsoft and Intel cope with dozens if not hundreds of journalists worldwide. They even deal with journalists that they think view them unfavorably.