long countdown timer, how to save power?

[Darrel Taylor]

I assume that GIE and TMR1IE have to be set in order for this to work.

The only thing i might add is TMR1H.7=1 so that it will wake up every second instead of every 2 seconds.

You need to leave GIE OFF, since there's no Handler for it to jump to.
But I think you're right, you may have to turn TMR1IE on to get it to Wake-Up.

TMR1H.7=1 will work too. But it's waking up twice as often as needed, and will use twice the power.

And after a month, a 1 second difference is less than the error rate, so attempting to get 1 second accuracy is futile at best.

DT