How long can you survive in space without a spacesuit?

things that you have to do to stay alive a bit longer: Breathe out: Just like an ascending scuba diver, if you hold your breath, the gas expanding in your lungs due to reduced pressure would cause them to rupture. Stay out of the sun: without protection, serious sunburn can ensue. You are going to swell up: In the vacuum of space, your body fluids will vaporise, causing tissues to swell up.

note: this is a topic around chemistry and logic (maybe physics and Biology too)