Well it is the fictional pepper from The Simpsons, however two people on the internet have estimated it's heat, a blog post from Postdoc Street in 2013 speculat

Well it is the fictional pepper from The Simpsons, however two people on the internet have estimated it's heat, a blog post from Postdoc Street in 2013 speculates 3.0 million, and there is a youtube channel created two years ago, named "Guatemalan Insanity Pepper 13m Scoville". So it's either 90% as hot, or 20% as hot.