Maybe I'm doing something wrong, but shouldn't the commands (run separately)
notify-send -t 1 "test" notify-send -t 1000 "test" notify-send -t 10000 "test"
Have different timeouts? The first being nearly instantaneous, the second one taking 1 sec and the third 100 seconds. In all cases it seems to take about six seconds.
I'm using the development branch of Precise, if this isn't an issue in the released version I'll close this as being too localized, but I'm unable to test it now.