It took an hour at most. [=it took no more than an hour; it took an hour or less than an hour]最多花了一个小时。

She only worked here for a month or two at the most.她在这里顶多工作了一两个月。

It costs, at most, only a few dollars.它最多就花费几美元。

This is worth $10 at most.这最多值10美元。