I wrote -

> I'd suggest you not use a 4MHz time-base, but 32768Hz. This
> makes counting and rollover IRQs from TMR0 very easy

The other advantage is power consumption. The slower the PIC
runs, the less it uses

eg ~ 1000 - 2000uA 4MHz 5.5V (XT mode) versus 35uA 32kHz
3V (LP mode), a substantial saving

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