Well BoB, you enjoyed it whilst it lasted.

[Implementation of Auto-Logout]
Because there are so many users attempting to login even when the maximum allowed number of concurrent logins has already been reached (in other words when login restrictions are in place) we have now implemented an auto-logout feature. In an attempt to provide as many users as possible a chance to login, characters that appear to be inactive for thirty minutes will be automatically logged out of the game.
FINAL FANTASY XIV, The Lodestone | Regarding Details of Recent Maintenance (Sep. 12)