Advent of Code Part 2 Timer is a free Chrome extension developed by Marcela Errazquin. This extension is designed to enhance the Advent of Code experience by adding a new column to the personal stats page. This new column displays the time it took for users to complete Part 2 of the programming puzzles.

Advent of Code is an Advent calendar of small programming puzzles that can be solved in any programming language. It offers challenges for a variety of skill sets and skill levels. With the Advent of Code Part 2 Timer extension, users can easily track their progress and see how long it took them to move from Part 1 to Part 2 of the puzzles.

To use the extension, users need to generate a private leaderboard on the Advent of Code website. Once the leaderboard is set up, the extension will automatically track the first time users open a puzzle and adjust their completion times accordingly. This feature allows users to accurately measure their progress and compare it with others on the leaderboard.

Overall, Advent of Code Part 2 Timer is a helpful tool for Advent of Code participants who want to keep track of their completion times. It adds a valuable feature to the personal stats page, allowing users to monitor their progress and challenge themselves to improve their solving speed.