Show Custom Events duration in Sequencer

I’m making a dialog using sequencer, calling Custom Event - PlayVoice in it to make characters speak. Depends on whos speaking I change camera shots. But the poblem is I can’t see duraion of the dialog in the sequencer, so I need to listen dialog each time to know where it end and in this place change camera shot. It would be more easer if my custom events shows duration of the dialog, then I could simple set camera shots, not listening each voice every time.

Here’is how it looks like (white dots it’s my custom events that trigger PlayVoice, so I want them to have duration like CameraShakeMatinee below)

Any ideas how this can be achieved? Or other solutions which could save time?

can’t just add an audio track and put a wav file in it?