The History of Rome in 179+ podcasts. Done in increments of 12-20 minutes. Great for short commutes.
Dan Carlin's Hardcore History as mentioned by ghaff, but yes, it's extremely long form.
Tides of History - different topics and somewhere between 45 - 60 minutes.
History of philosophy without any gaps if you're into philosophy.
From Wittenberg to Westphalia; History of the Papacy podcast; History of China podcast.
I'm not a fan of Hardcore History - it seems more about the drama and theatricality of Carlin's own voince than about the historical content.
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