Before 4.6.x the ACP timeout respected the session.gc_maxlifetime value in the PHP configuration, mine is set to 28800 seconds.
But after I upgraded to 4.6.2 last year the timeout has been 60 minutes, is there any way of increasing this now?
All I can find is the DEV_DISABLE_ACP_SESSION_TIMEOUT option for constants.php, but I want this for a production environment.
(Not entirely sure this happened exactly when going to 4.6.2, but it was around that time)