CHICAGO — “Can you last five minutes?” That is the challenge issued by Flamethrower Candy Co., St. Louis, the maker of The Toe of Satan lollipop. The product contains nine million Scoville units. To put it in perspective, that is roughly 900 times hotter than a jalapeño pepper. Hundreds of social media posts are devoted to the spicy sucker showdown. Beyond bragging rights, the prize is unclear.