Yeah, I know. It's people like that who give us a bad name...
I am sure there are some Russians who are mad about it, and there are a good deal who aren't. Honestly, I don't think the Americans came off very well in MW2 either, so it did not really feel like a "F*CK YEAH, WE'RE AMERICA! KILL THOSE AGENTS O' TERROR!", it felt more like that there was corruption everywhere. Still, no matter what the issue, there are always some people that are offended. As a whole though, I would not think the majority of Russians would be angry, not that I am their spokesperson or anything.
My longest gaming period was when I played for 24 hours straight, because I was participating in Extra Life.
Usually I don't play for more than an hour or two at a time, though I did play for a good 6 hours straight in Fallout 3, and when I used to play WoW I would get into 4 hour dungeons every once in a while.