If I live longer, great, but I'd be living on borrowed time.

如果能活的更长，很好，但那时已经是借日子在活命了。

youdao

The Greek government might be living on borrowed time, but European finance ministers have just borrowed a bit more.

BBC: More time to argue about Greece

But even these craftsmen may be living on borrowed time.

ECONOMIST: Italian textiles and China

So Hyundai Engineering and Construction seems to be living on borrowed time as well as borrowed money, with about a fifth of its 5.2 trillion won debt falling due at the end of the year.

ECONOMIST: South Korea dumps the past, at last