This is just the way it goes - nobody is able to do the same routine job they've been doing for a while for more than say a cumulative 6 hours a day. Taking a break to say read slashdot (= keeping up with developments), socialising, talking about football (= good for teambuilding!) relaxes the mind and will allow for another few hours of good, concentrated work. If you want to make a career, better to join in occasionally, otherwise you'll be the odd one out, the one who won't be part of the team, and, importantly, the snotty just-out-of-school kid who thinks he knows better that everyone loves to hate. Which in end-effect you are because a. you have no experience, b. no life-experience and c. you don't keep up with developments, whether it be professional (slashdot reading!) or social (talking about football, the families and so forth). So, relax, get used to it and participate as much as you can without screwing up your own portion of the work.
"Atomic batteries to power, turbines to speed." -- Robin, The Boy Wonder