What does “at the latest” mean?

no later than the time or the date mentioned

How is “at the latest” used?

In Double Indemnity (1944), one line is: “It's only for four days. I'll be back Monday at the latest.”

The clip at the top of this page is from Double Indemnity (1944).

It's only for four days. I'll be back Monday at the latest.

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