[sgornick]

The rate will slow though, to 25 BTC per block (down from the current 50 BTC per block).

So it took 4 years from 0 - 10.5 million, then the next 4 years sees 5.25 milion minted, then 2.125 million in the 4 years after that, and so on for decades until all 21 million have been minted.

[jasonlingx]

from what I understand, the rate will keep halving and the 21 million will never be reached, it is just a theoretical maximum