one's turn; one's shift
General use for a person's scheduled or expected turn to do something, such as a work shift or a role in a group activity.
It's your turn next.
His shift starts in the afternoon.
stage appearance; screen time
Specifically refers to an actor's, performer's, or character's moment on stage or on screen.
Her stage appearance is in the second act.
The supporting characters have little screen time in this movie.
chance to act; moment to shine
Figurative use for a person's opportunity to demonstrate their ability or play a significant role in a situation.
This is your moment to shine—do your best.
Prepare for the time when you'll be called upon.
It'll soon be my turn to go on.
The actors were waiting backstage for their cue.
I didn't get a chance to contribute on this project.
He rose to the occasion in the crisis moment.