[turn off particles after 8 seconds ?]

 

 I have a particle  script  it is set to  listen to  owner on channel 21  say on or off,   on  / 21 on it  starts the particle  burst   but i need it to automatically stop after  8 seconds   so not really need i the / 21 stop  part of the script  and  just cant work out how to do this.

 i appreciate your time 

 

addie