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Read the heating pad box carefully. Almost all of them automatically shut off in an hour or two. Even electric blankets are set to shut down after 8-10 hours which wouldn't be a problem for your application.
I am designing a small (very small) trailer and am looking at the candles in tall, slim glasses, some of which come with religious icons on them. Dollar Tree has them for, of course, a dollar and they burn for something like 80 hours. Enclosed in a taller pipe with a small pipe inside filled with water and carrying the heat wherever you want it is my current design. Could work in a car.
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