User blog comment:Yggdrasil Magical Tree/The Death Star VS Borg Cube Ship/@comment-4693949-20120527180128/@comment-4826523-20120531023817

Assimilation of machinery is pretty fast, it would take the Borg just a minute or two as soon as they are in contact with it. Assimilation of a person is a little more tricky. The borg drone needs to be in hands reach of the person, in order to insert the nanites into the bloodstream, after that it just takes a second for the individual, and all its knowledge, to be part of the collective. Weapons is even easier, if the Borg survive a blast, they then know everything about that weapon's power and will assimilate the information to adjust their shields and the weapon is then useless. This, however, does not work with non-energy based weapons, like explosions or light sabers.

Something as big as the Death Star, as soon as the Borg drone touches it, will be assimilated exponentially, faster and faster, and in about a day or even 12 hours, all of it would be assimilated, and therefore part of the collective. Again, the X factor would be Vader, there is no clue as to how he could use the Force in this situation.