The fastest time to shell one unpricked boiled egg is 5.59 seconds, achieved by Matthew Mark Mason (USA), in Wilmington, North Carolina, USA, on 15 January 2012.

This record was broken on the Guinness World Record Challengers site (Challengers’ tag: mmm0225): http://challengers.guinnessworldrecords.com/challenges/91-fastest-time-to-shell-a-boiled-egg