I have a request to videotape a lab test that runs for 7 continuous hours. The client is on a budget and I am trying to quote for only raw footage and no post production. The question is which camera can record 7 hours continuously with .mov format so he can playback without post processing. I currently use a Panasonic HMC80 that produces .mts files which is not going to work, my dslr's stop at 20 minutes. I was looking at the gh3/4, would they be a good option this is only for 720p. But then how about continuous power for gh3/4 is it possible, will I encounter overheating problems. Any video camera suggestions. Again the client needs the test footage uninterrupted and I don't want to take it to post just copy the file and give it to him, that's why the camera needs to record .mov. Any suggestions?