Hearthstone speedrun – blackrock crash tavern brawl (fire festival or should we say Fire Fest-E.V.I.L tavern brawl) completed in 15 min 25 sec. So if you want to beat all bosses under 40 minutes here is a solid example
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music:
ES_The Hipcat Swagger 1 – Martin Landh
Production Music courtesy of Epidemic Sound: http://www.epidemicsound.com