till you're blue in the face

You can tell people till you’re blue in the face that, if they want to save money, they have to earn more than they spend.

You can tell diners, till you’re blue in the face, about the benefits of kelp aquaculture, but unless the seaweed bowl tastes good, few will care enough to keep buying it.

“None of this means anything anymore. You can scream till you’re blue in the face, and still be standing in the same place,” I said.

I’ll do this till you’re blue in the face.

You can talk about it till you’re blue in the face.