> Why is there no spec for "Time from interrupt to SLEEP mode
> exit"?! (Or maybe there is and I haven't seen it...)

Look in Section 3.2.4 (and elsewhere) of the Mid-Range Reference
Manual (2.64MB)

http://ww1.microchip.com/downloads/en/DeviceDoc/33023a.pdf

I'm pretty sure that there is no start-up delay with IntRC

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