Calculation for IC lifetime for supply voltage overvoltage
There is no &quot;one-size-fits-all&quot; answer to this question. You need to contact the manufacturer and get their accelerated lifetime test data. It is likely that if you are using the device within its maximum specifications that there will be no data regarding small variations in supply voltage.
Otherwise, you will need to do life testing yourself.
Remember that these effects can vary dramatically from one manufacturing lot to another.