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How Many Blocks Trigger a Difficulty Adjustment in Bitcoin?

A difficulty adjustment in Bitcoin is triggered every 2016 blocks. Given the target block time of 10 minutes, this interval is designed to take approximately two weeks (2016 blocks $times$ 10 minutes/block = 20,160 minutes $approx$ 14 days).

How Does Mining Difficulty Adjust Based on the SHA-256 Hashing Rate?
What Is the “Retarget Period” in the Bitcoin Difficulty Adjustment Mechanism?
If the Hash Rate Suddenly Doubles, How Soon Will the Next Difficulty Adjustment Occur?
How Does the Difficulty Adjustment Mechanism Relate to SHA-256’s Output?