What does “in the end” mean?

after a long period of time or series of events

How is “in the end” used?

In Night and the City (1950), one line is: “Probably starve doing it, but I'll master it in the end, I promise.”

The clip at the top of this page is from Night and the City (1950).

Probably starve doing it, but I'll master it in the end, I promise.

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