Till/until kingdom come
Definition 1 of 1
Pro Tip 1/3Time Exaggeration
Used to stress that something will continue much longer than desired or expected. 
He'll be playing that video game till kingdom come if we don't stop him.
Pro Tip 2/3Less Literal
The phrase is not meant to be taken literally; it's an expression for dramatic effect. 
You can wait for a perfect job till kingdom come, but it's better to start somewhere.
Pro Tip 3/3Emotional Frustration
Expresses a sense of frustration or resignation over how long something takes. 
She's been trying to fix that old car till kingdom come.