Halvings are scheduled to happen after every 210,000 blocks that are mined — or about every four years — until the maximum supply of bitcoin is all released. 
Just reminder for my list.
» 2020 (6.25) high price 71k des'
2024 (3.12) midhigh price 67k on april, predict for des' 77k to 80k
2028 (1.56) what you have for this. still bullish, predict to 100k -150k
» 5 years tradition on 2029, halving 2028  starting on before it, different parabolic to high i think.
» 2025|2026|2027 to...