FYI:
People with 1 billion coins in 1 block are staking about once or twice every 30 days,
so you are looking at many months to a year before 20 million in 1 block would stake at the current difficulty levels.
Difficulty levels should decrease over time as coins get burned.
Thanks, mate! Oh, it's terrible

"to a year"... I will wait for burning. I think 10% of all coins must be burned.