(idiomatic)forever; One will never in their life get the results that they want, no matter what they're doing involving the situation.
He can continue to be hard on himself until **** freezes over, because he's so self-centeredly pessimistic that there's nothing I can ever do to lighten him up and get a life.
They can be bellyaching to me about their life's problems until **** freezes over, but it doesn't mean that they'll ever get my sympathy.
I am prepared to wait for my answer until **** freezes over.