You can also use Remote Buddy's AppleScript support itself to show a 
notification for a given duration, btw.

Here's an example:

-- snip -- 
tell application "Remote Buddy" 
osdmessage display text "Hello and welcome to this little demo" for 
duration 3.0 
delay 2.8 
osdmessage display text "Showing a shorter string!" for duration 2.0 
delay 1.8 
osdmessage display text "Bye Bye ;-)" for duration 1.0 
end tell 
-- snap --

Best regards, 
Felix Schwarz