Uhh... 508 seconds = 8m 28s. I figured it out with a basic comprehension of math you seem to lack. Still impressive but slightly different to the figure you came up with. Answer.the world record for...
The record recognized by the Association Internationale Pour Le Developpement De L'Apnee (AIDA) is 11 min 35 sec held by Stéphane Mifsud from Hyeres, France (2009-06-08).The unofficial record for...
There actually is no record, since it's not possible to prove "I have a headache", "I still have a headache" - there are no other symptoms, unlike world records for the "longest hiccuper" etc......