how to play sound again when previous sound is done?

Im making an SCP mod and im trying to make (this might sound random) a singing flytrap, and I want it so if its singing already, if you right click it does not play again, and when the sound is over (sound is 1600 ticks or 40 seconds) it will play again. sorry for the messy code

https://imgur.com/a/DpLq38v?third_party=1 hopefully copy and pasting the link will bring you to the image.