Ask her when she will come back.
I cannot say when she'll come back.
Are you sure of her coming on time?
Please tell me when he'll be back.
Please check on when he will return.
Tell me when he will come.
Tell me when he'll come.
Let me know the time when he will come.
I've been waiting for her for an hour.
Please tell me what time he was waiting until.
Please tell me when you are coming back.
Let me know when you'll return home.