Well, last night I pushed my NEX5 to its limits. I LOVE the video capability of this camera. DS is in the jazz band at his college, and I've taped his concerts before. But last night's concert was the longest - 6 pieces. I stopped recording when each piece was done and didn't record while the director was talking about each piece. In order, each piece was 5:06, 9:04, 5:48, 7:04, 4:23 and 3:19. About 1/2 way through the next-to-last song (the one that's 4:23), I saw a yellow "overheating" warning in the viewfinder. It stayed on until the song was done, when I stopped The recording. I waited while the director talked about the last song, and then I pushed the record button again for the last song. And it made it all the way thru the last song, no overheating warning or anything.
When I took the camera off the tripod, it was extremely warm where the lens joins the camera body. DH thinks maybe I was panning too much and making the autofocus work too hard? Or maybe it was just too much recording with only 1 or 2 min breaks between songs?
The video turned out fantastic, even the song when the overheat warning was displaying.
So take this as a warning if you'll be using the video on your NEX! Watch out for overheating.