In short, yes its kind of a bad idea. The goal for engine break in is to allow it to heat cycle and run a varied loads and rpm. Now, if you take your time, and make sure to run different speeds, from like 50-80 mph, shut it down and let it cool for a few hours after 4 hours or so of driving you will be fine. Just gotta plan for that and increase your expected travel time. The other issue is that if something goes wrong most people try to make it to the next exit, and that will lead to more damage being done to the engine, potentially.
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