I wonder how long Sheldon's got.

我想知道谢尔顿还有多久才崩溃。

Tabitha wondered how long the woman had been scratching a living on the waterways.

塔比瑟不知道那个女人已经靠这条水道坚持生活多久了。

How long does it take for him to recover remains a mystery/is still unclear.

他什么时候能够康复还是个未知数。