Class and Level Geekery VIII (spoilers ahoy!)

[RMS Oceanic]

Assuming they ask no more question, the speak with dead pins Durkon's level at either 13 or 14, based on speak with dead providing only three question. Any higher and they've have one more question to ask, if I'm reading the spell description correctly.

You're reading it wrong. You get one question per two caster levels, so they have a minimum of three more questions based on Durkon's previous minimum level. If they use them, that is.