The “4-year” cycle is anchored to the first 2015 bear low. The actual low was printed 7m later!
Adjusted Bull Market lengths:
+ 25 m (Halving 1)
+ 28 m (Halving 2)
+ 35 m (Halving 3)
+ 46 m (Halving 4)
From this perspective the 4th parabola still has ~8 m to run.

BTC
68,087.62
+3.42%