I guess I'm missing something because the concept of quorum deals with partition tolerance. You require, to provide an answer, that X nodes agree on the state of the data.
3 nodes, 2 must agree. When the partition heals, the resolution process happens. It would have to be a SERIOUSLY bad network design and quorum setting that allows a quorum on both sides of the split.
It's just like eventual consistency. We're not talking days or even minutes. We're talking milliseconds/seconds of partition split. If you have a partition split for days, you have OTHER issues to address.