DPReview has completed their own testing of the various video record times for both the Canon EOS R5 and Canon EOS R6.
As we’ve seen, the cameras do record to Canon’s claims, but with the same huge caveat. You only get these times from a completely cooled camera. So that means the times change when you use LiveView, shoot stills, or shoot any shorter length of video, doing that over and over will eventually lead to overheating. The EOS R5 took about an hour in the DPReview test to get back to normal temperature. The surprising thing DPReview found, is that the EOS R6 will generally record longer, but it takes longer to cool down.
DPReview gives a few suggestions for maximizing your recording time with both the