Question

How long could you survive in Space without a Spacesuit?

Answer 1

by the oxygen cylinders........

Answer 2

At most, an astronaut without a suit would last about 15 seconds before losing conciousness from lack of oxygen. (That's how long it would take the body to use up the oxygen left in the blood.) Of course, on Earth, you could hold your breath for several minutes without passing out.

hope it helps