The guys were up there for a month at a time.

士兵们在那儿一待就要待一个月。

Some other places on the Moon don't get any sunlight for nearly a month at a time.

月球上的其他地方一次有近一个月没有阳光。

Now I often go for a month at a time without even thinking about the fact that I have only three fingers and a thumb on my left hand.

现在我经常一次去一个月，甚至都没有想过我的左手只有三个手指和一个拇指的事实。