How to quickly extend the timeline?

I downloaded the trial version of toon boom harmony and i’m having a bit of trouble with extending the timeline for an audio file i have.

I was hoping to do a quick (lackluster) 5 minute animation, but the entirety of the audio file is around 7200 frame.

My question is that is there a way to expedite the process and automatically have my sound layer at that many frames? or must I drag the timeline border along for minutes on end?

From Stage’s Menu-Scene-Scene Length…