How long will it take for a person to die without oxygen or a space suit in space?

Question: How long will it take for a person to die without oxygen or a space suit in space?
- Keywords:
  death,
  oxygen,
  space
Asked by marinebio1213 to Ed, Hayley, Jason, Nathan, Sophie on 12 Mar 2013.
- Hayley Evers-King answered on 12 Mar 2013:
  
  You would lose consciousness in approximately 15 seconds and would be totally brain dead within about 3 minutes! So pretty quickly, best take a space suit!

Question: How long will it take for a person to die without oxygen or a space suit in space?