Sounds like another overdose at the same location with the vitals you've provided.
If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck.
I too have never had IN not be effective. What is a reasonable amount of time? If you can ventilate without difficulty and keep your Sp02 up what is the rush to intubate or blast someone with IV Narcan? If it's taking them that long to wake up with IN Narcan it's probably polysubstance.