Post #2
(Posting another one since my prediction is wrong.)
Usually it would take at least 2 years to mine 1M Bitcoin. There is a twist though, Bitcoin mining reward will decrease even more which would cause Bitcoin's mining rate to slow down. So there will be another half in the future so instead of 2 years, it would double to 4 years so it would take 4 years to reach the milestone of 20 million bitcoins. Then, it the bitcoin mining reward would decrease after and the bitcoin mining rate would decrease even more and it would increase more time to mine 1 bitcoin.

Everyone makes mistakes and I only know little about the halving.