How far can you make Mashed Potatoes ahead?

I've been 'assigned' mashed potatoes for the family Thanksgiving potluck. I don't make mashed potatoes that often and when I do I always serve them immediately. For Thanksgiving, I need to make them, drive 1/2 hour, then we won't even be serving for another hour after that.

Can they sit around without getting gummy or separating? What's the best strategy here? I can't plan on making them there b/c there'll will be too much going on.

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