The metal casing acts as a means to "release" the internal heat building-up. A vent would mean openings in the build, which lends itself to larger problems–such as a means for moisture (or dirt, dust, etc.) to make contact with the internal electrical components! A fan is out of the question too–the noise alone would be problematic.
Best practice is to place the mixer on a non clothed surface. Personally, I use something like this. It helps dissipate heat and enables the mixer to be angled ergonomically.
Having said all that, ten hours is a long-ass time, heat is an inevitable bi-product. I personally can't comment on the scent, however, I would be more concerned if the smell occurred sooner than ten hours of use.
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