千载一时

千载一时[遇] [qiān zǎi yì shí]

1. ■ a golden opportunity; an extremely rare chance [opportunity]; a (very) rare opportunity; only once in a thousand years; (A thing like that) only happens once in a blue moon; a time of a thousand years; the chance of a lifetime:

不要糟踏这样一个千载一时的机会。 Don't waste such a golden opportunity.