Helpful Nephew

I walked into my sister’s kitchen and found my nephew having a snack.
“Where’s your mother?” I asked.
“She is upstairs, said she was going to take a shower.” came the reply
“Do you know how long it’s been? I need to ask her an urgent question.” I asked.
He stepped into the nearby bathroom and flushed the toilet. A second later a sharp yell came from upstairs.
My nephew walked back out and said, “Won’t be too long now.”