Getting time since experiment started

[Labyrinth]

Hi,
I am trying to make a sound that goes up in frequency continuously at a given speed. I have tried using the timer function, however I noticed that "until the current analysis run began" apparently meant "until the start experiment button was last pressed" and not "until the last time the analysis's script was ran". Is there a way to get the time since the analysis last began?

Thanks in advance,
David