Canon 5D MKIV No Clock Batttery?

I see the 5D4 doesn't have a clock battery like the previous 5D3 did. Assuming the clock runs off the main LP-E6n battery, how long will the clock continue to work when I take the battery out to recharge it? Thanks.

There's some kind of super capacitor, or whatever it is, inside to keep it running. I've never waited long enough for it to stop on my camera with the same design.
Besides, when you have GPS in the camera, it can set the time automatically, should it ever get wrong.

If it is the same as my 7D2 then the internal "battery" will last hours. I've had my main battery removed for at least 5 hours with no issues.

Rod

Thanks for the responses. I called Canon and as a previous response said the clock runs off a capacitor that gets charged by the battery.When the battery is out of the camera the capacitor is good for about two weeks.