The Pixel 3 was released on the 18 October 2018^[1], which marks the beginning of its update period. On the 15 August 2022, the Android 13 was released, a next version of the operating system, which not made available for the Pixel 3, thus leaving Pixel 3 on the the previous version of the operating system, the Android 12^[2]. This date marks the end of what we consider its update lifetime.

These two dates are 3 full years and 10 full months apart, which gives it C tier.