On a system I'm designing, you can provide a 2nd (or 3rd, 4th) password, which affords an user of said username/password combination a subset of the permissions _you_ have, which stops working after a date.

This has made multiple product owners cry. I am wondering if it would make sense to add a 2ndary action prompting the user at the eol for this secondary credential asking them if it went fine, to try and collect some information on how popular the feature is.