I think a grown tree would should out pretty long. The pressure in the tracheids is so low already that water should be boiling inside a tree in normal atmospheric conditions. The capillary forces of the narrow tube and the surface tension of water hold the water liquid. I could imagine the water in the top 10% of the tracheids evaporating in less then a minute but the rest will take a long time to drive out. I might be wrong though I couldn’t find any papers on plants in vacuum. Lots about zero gravity and space radiation though…