Gerald Undone, one of the premier camera tech YouTubers has completed an exhaustive record time test on the Canon EOS R5 and Canon EOS R6.
He hopes to have the full video up on Monday or Tuesday for your viewing pleasure, but for now, he has provided us with a handy chart detailing his methodology, record times in all modes both internally and externally.
All of these tests were done indoors in a climate-controlled environment.
As for recovery time, Gerald has this to say:
It should also be noted that these times are from a 2 hour cooldown period. You will only get these durations once, then they’re significantly cut down. Takes about 1 hour for 60% recovery and 2 hours for full recovery.