If you choose to participate in the ABOS WLA, the ABOS recommends that you begin now but you must start by 2022.
You must achieve five Quality Years by 2026. A Quality Year is achieved by correctly answering 24 out of 30 questions.
You must submit your Recertification Application, Application Fee, Case List, and CME/SAE requirements by December 1, 2027 (can also apply as early as 2022).