7 is probably stretching it.
The only thing is it "might". Might be fine, might not.
Why not cool it and then reheat there, that's safer than giving the family FP for Thanksgiving.
It "might" stay warm if you preheat the cool, minimize the amount of air space, don't open even once until you get there (I'd even seal it with tape). The key is to keep the food above 140. You could even put a heating pad in to keep it warm (wrap it in plastic).
Several options, but 7 is the extreme.
My cambros would hold it that long, but they're super air tight and very well insulated.