They don't seem to want to change the timeout or make it configurable, here is the full discussion about that https://bugs.launchpad.net/ubuntu/+source/notify-osd/+bug/390508
They don't seem to want to change the timeout or make it configurable, here is the full discussion about that https:/ /bugs.launchpad .net/ubuntu/ +source/ notify- osd/+bug/ 390508