Keeping Skype away for sometime in OSX

This is a small AppleScript for keeping Skype in DND mode during lecturing or giving a talk and automatically put it back. It accepts the number of minutes from command line, sends Skype in DND and then at the end put it back online.  The snippets at the beginning and end can be used to manually controlling the status via command line. The accepted options are "AWAY/OFFLINE/DND/ONLINE".

on run durationmin
 tell application "Skype"
    send command "SET USERSTATUS DND" script name "My Script"
 end tell
 
 set durationsec to durationmin*60
 set startTime to current date
 delay durationsec
 set elapsedTime to ((current date) - startTime)

 tell application "Skype"
    send command "SET USERSTATUS ONLINE" script name "My Script"
 end tell
end run