Until doomsday and Until the twelfth of never

Until the twelfth of never and until doomsday are semantically related. In some cases you can use "Until the twelfth of never" instead an adverb phrase "Until doomsday".

Until doomsday and until the twelfth of never are semantically related. You can use "Until doomsday" instead an adverb phrase "Until the twelfth of never".