Ever wonder how long a crypto bull run actually lasts? I've been digging through the historical data, and there's actually a pretty interesting pattern here.

Looking back at the last decade, each bull run seems to have its own rhythm. The 2015-2016 cycle ran for about 17 months before cooling off, while the massive 2017 bull run compressed everything into just 12 months of absolute chaos. That one felt faster because everyone was watching.

But then came 2020-2021, which honestly was the biggest bull run we've ever seen. Starting from the COVID crash bottom around $3,850 in March 2020, Bitcoin didn't just recover—it exploded. We hit a new ATH near $69,000 by November 2021, and that entire run lasted roughly 20 months. That's the longest sustained bull run on record.

The most recent cycle is interesting because it picked up steam after the FTX mess in late 2022. Starting around $16,500 in early 2023, we pushed all the way to $73,738 by March 2024. That was about 14 months of solid upside.

What's fascinating is the timing. Most bull runs seem to kick off right after Bitcoin bottoms out, then we get this parabolic growth phase that typically lasts anywhere from 12 to 20 months. Then comes the inevitable bear market that can drag on for years.

The halving in April 2024 was supposed to trigger the next cycle, and honestly, looking at where we are now in 2026, it did. Bitcoin's already broken through to new all-time highs around $126K, which is wild. The pattern holds—roughly 18-20 months after the halving, we're seeing the real fireworks.

So if you're asking how long a crypto bull run lasts, the honest answer is: it varies. Could be as short as 12 months if the market's emotional, or as long as 20 months if the fundamentals really align. The key is recognizing when you're in one and positioning accordingly.