Hello Stephi,
Show control has timers. Timer can be set to create a trigger after a specified time.
Use the task Timer -> Time -> Set to set the amount of time. For example 2s for 2 seconds.
And then the task Timer -> Playstate -> Start. Which will start the countdown.
Now you can add an action in the timer actionlist. Which will respond to the timer. You will probably want to set the trigger flank to stop. Inside the timer action you can disable blink and set the Art-Net value to 0.
I hope that this information was helpful.
Best regards,
Guido