>I use only flash devices (16F628, F870 & F877) and I have used precisely
<snip>
>variable that controls the relays.
>
>Assuming the life of each location in the EEPROM is one million
>erase-write cycles, if the status of the relay changes 100 times per
>day, then the device will last for more than 27 years! Even assuming I
>continue to use the gadget, I can switch to another location in the
>EEPROM for another 27 years!!

The 16F87X data-sheet shows the life of the EEPROM as 100,000, not 1
million, at 5V and 25degC. So, on that series of chips the life would be
less than 3 years and, if the temperature gets hotter than 25C the life will
be shorter.

Paul

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