Probably 20+ years for a lithium coin cell... basically the shelf life of the 
cell.  I have a card of 24 year old CR-2032's that are still above 3V, and no 
sign of leakage.

BTW, never handle a coin cell (particularly in watch applications) with your 
fingers... your grubby fingerprints are rather conductive and can discharge a 
cell surprisingly quickly.   

Also note the clock chip has 512 bytes of RAM in it.


> Assuming you are going to run it off a battery. What’s the self discharge
rate on a reasonable battery? 
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