To be clear - you are asking about a user account configured on the 800 router and using local authentication rather than some authentication software (Radius or Tacacs or anything)?
I am not aware of any way to configure expiration of passwords for locally configured accounts on the 800 series router. If anyone in the community knows how to achieve this I would be very interested.
a possible workaround would be to use EEM scripts to add/delete users. In the scripts below, user 'admin' is delete every Monday thru Friday at 8PM, and added every Monday thru Friday at 7AM. I am not sure what exactly you want to accomplish, but you can tweak this and use it for whatever purpose:
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