Trusted devices for 30 days

When you enter your two-factor code you can tick "trust this device". On that browser you will not be asked for a code again for 30 days, while everyone else still is.

Trust is stored in the browser and tied to your user and to the exact authentication factor you enrolled. If you delete your two-factor setup and enrol again, or somebody removes the connection, every previously trusted browser is invalidated and the code is requested again. Clearing your browser data has the same effect.

Only trust devices that are yours and locked with a password or biometrics; never do it on a shared or public computer.