“till the cows come home”别理解成“等到奶牛回家”，真实含义是长时间地；很久；无限期；永远。

【例句】
We were having so much fun that we decided to stay at the party until the cows came home.
我们过得如此开心，以至于我们决定在派对上待很久。

I could sit here and argue with you till the cows come home, but it wouldn't solve anything.
我可以坐在这里无休止地跟你争论下去，但那样不解决任何问题。