A vote of shareholders could happen quite quickly. I've only been in one security that was bought out, and the whole thing, rumor to finish, vote and all, was done within 3-4 months (Corning buyout of Nichols Labs way back when). BTW, I lucked out and bought a couple of months before the rumor even started, and tripled my money on that one ($4 -> $12) - no skill other than liking what Nichols had going, just dumb luck.
I believe the vote part could be handled in mere (3-4) weeks (see SEC regs).
But I KNOW nuttin'!
SGE