Jack Denver wrote:
It really depends where you are - if you are in a rural area with above
ground lines and lots of ice storms, hurricanes, etc. then not too good. In
an urban area with buried lines, power may go uninterrupted for years at a
time.

If it's critical that the clock not stop you can put it on a UPS battery
backup.

Interesting thought. Would the clock then be driven by the
line frequency or the oscillator frequency of the UPS?

Mark