drop by 顺便到(某处)去一下；顺便拜访；顺道拜访；非正式访问

【例句】
Also drop by the Chinese Footbinding Culture Museum, which offers a glimpse into a tradition that seems unreal in today's world.
此外，顺道拜访一下三寸金莲展馆，这里能让你一窥在今天看来似乎完全不真实的传统。

That means we can drop by for a few minutes or we can stay as long as we like.
这意味着我们可以顺道来访几分钟，或者我们可以想待多久就待多久。