I don't have a CVAP but I believe Aaron Franklin holds his briskets 12 hours or more. I have a warming cabinet but haven't had a chance to test hold times with it. The article below was shared the other day and it discusses wrapping and holding techniques by some of the well known restaurants.
If you get your CVAP dialed in, you should be able to go 12+ hours. A regular heated cabinet should give you the same, but I'd be sure to wrap in foil to decrease moisture loss.
I've kept briskets in a 150 degree Alto-Shaam in a foil pan with a little au jus for six hours without a problem. The bark softens but other than that it's fine.