No reason for bluff. As previous poster has mentioned, based on the CPF contribution limit, it is possible to achieve this amount.

Just consistent and diligent CPF contributions and top ups. I also do transfer from OA to SA so that helps in compounding at higher interest rate. Below is my CPF balance as of today. I have maxed out MA and almost hit FRS in SA. The reason that I have some amount in OA is to act as a buffer for my upcoming property purchase and I intend to transfer the OA funds to SA if I do not need it for my property (highly likely).

As an additional fun fact, I have attached my first CPF contribution in Jun 2008 prior contribution was from my part time job in JC. Lol. Based on my projection, I should be able to reach 1mil CPF by 50 (albeit a conservative estimate). Being able to reach such an amount like the previous poster is one of my retirement goals.

PS: I am a strong advocate of using CPF for retirement planning. That being said, I think I have got some room to brush in terms of my portfolio as I am holding on to too much safe assets which may impede my portfolio growth.