I don't believe you can survive in a true vacuum. Your skin would bruise instantly for one.
Unsurprisingly, there is little data on this, but what there is seems to indicate that vacuum is survivable.see e.g. http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/970603.h..., http://www.newscientist.com/blog/space/2008/06/how-long-can-...