The second phrase we use with cows is the phrase: 'Till the cows come home.

我们对奶牛使用的第二个短语是：'Till the cows come home。

So basically the 'till the cows come home means you know he did it 'till the cows came home so he did forever.

所以基本上“ 直到奶牛回家” 意味着你知道他做到了“ ，直到奶牛回家，所以他永远这样做了。

If you were to say: He likes to work 'till the cows come home, it basically means that he likes to work forever.

如果你说：他喜欢工作到牛回家，这基本上意味着他喜欢永远工作。