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Originally Posted by RyanMcE
As far as I know (not an expert by any means), most EEPROMs are good for at least a million write cycles. So don't go writing to it every cycle, but every second should be fine.
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Ok lets do the math, 1,000,000/(38cycles/sec*3600 seconds/hr)=7.3 hours. not a lot of time.
Once per second gives 277 hours, longer, probably longer than you will need for the robot. But depending on the variable, it could be longer.
How often does the variable change? if it is not that often, you could detect when it changes, and then save it.