You won't find someone to do that job in a month of Sundays.你是不可能找到人干那个工作的。I haven't talked to her in a month of Sundays.我很久没跟她说话了。I haven't seen him in a month of Sundays.我很久没有见到他了。The Prime Minister will never appoint him in a month of Sundays.首相很长一段时间内都不会委任于他。