What they said. I have held whole packers for upwards of 4 hours, and they had barely dropped in temperature. But, that is no guarantee. Easy enough, if you know it will be a long hold, to place a Maverick probe in there and watch it.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
"perhaps...but then again...maybe not..."