The "remember for n idle minutes" option on the GPG key password is completely broken on OS X, both on Intel and PowerPC (with Tenfourbird). Sometimes it functions as expected, many times, however, a few messages can be sent later with the password/key still clearly cached, hours or even days after the "n minutes" expired, before the password/key will be flushed.
This can also happen through sleep/wake cycles on a laptop.
If never checking the "remember for n idle minutes" box is used as a workaround, the user may be prompted more than once to enter the key password.
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