somewhere else they were discussing how to use a 555 to time 55 years, and how for such a long period you'd need impractical resistance and capacitance values. easy workaround would be to set a more reasonable period, say, 1 sec, and use a counter to know when you hit 55 years. coincidentally, 55 years is 2 ** 30.7 seconds, so it'd just fit in a 32 bit register.

though i take you were thinking about counting clock cycles or something in which case surely your register would overflow

You don't check the eeprom value by flowing current thru the cell as you do with cap