What's the longest period of time in which a seat on the Supreme Court has been vacant?
What do you mean by that? It's just tradition to have 9 Justices. Historically, we've had both more than 9 and fewer than 9, until we sort of settled on nine. So, that question doesn't really make sense.
Let me rephrase that for you: since the tradition was set to have nine justices 100+ years ago by congress, what is the longest time in between a member leaving/dying and the successor officially taking the seat on the court? Is there any precedent for the court to serve with less than nine in that timeframe?
Was it that hard to figure out instead of playing some unpleasant semantics game? Unless you were just looking to display your knowledge of facts that most here are aware of.
