Definition of "at length"

Through all these she persistently pursued the object of her mission. Her search lasted for long weary years—she followed it unweariedly, till at length she was rewarded.

1861, E. J. Guerin, Mountain Charley, page 26

How long I slept I cannot tell, for I had nothing to guide me to the time, but woke at length, and found myself still in darkness.

1898, J. Meade Falkner, chapter 4, in Moonfleet

‘You got rather left there, old chap,’ said Monk at length.

1903, P. G. Wodehouse, A Prefect's Uncle‎, A & C Black

The proceedings of Congress are not given, since they are inserted at length in the "Congressional Globe;" but the principal bills are noticed under the date of their passage.

1800, Francis Vincent, United States Register, page 4