when does test result expire ?

[pmeenan]

They should be available forever*

* barring any catastrophic data loss that takes out the primary server and the backup data repository

The private tests do not show up in the test history and use non-guessable test ID's (normally the test ID's increment predictably). To see all of the public tests you can go to the test history and check "show tests for all users". Warning though, it creates a REALLY huge table and can seriously bog down most browsers - at some point I'll add pagination to make it more tolerable.