Per design: https://docs.google.com/a/canonical.com/document/d/1VajNkWbBH61iVixXJAmOvNGiG__GWQTMXGNOZijXWJw/edit#heading=h.6zhf6wqejmh6 (search for "passcode incorrect")
They want us to factory-reset the phone after 10 failed entries. While this isn't a delay, it solves the same security problem of trying to brute force the password.
Per design: /docs.google. com/a/canonical .com/document/ d/1VajNkWbBH61i VixXJAmOvNGiG_ _GWQTMXGNOZijXW Jw/edit# heading= h.6zhf6wqejmh6
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(search for "passcode incorrect")
They want us to factory-reset the phone after 10 failed entries. While this isn't a delay, it solves the same security problem of trying to brute force the password.