Each bull run in crypto history has varied in length, typically lasting from a few months to over a year. Here's a breakdown:

1. 2011 Bull Run:

Duration: Around 6 months.

Timeframe: Early 2011 to mid-2011.

Highlights: Bitcoin rose from under $1 to about $32 before a steep correction.

2. 2013 Bull Run:

Duration: Two main bull runs in one year.

First Bull Run: About 3 months, from January to April 2013.

Second Bull Run: About 3 months, from October to December 2013.

Highlights: Bitcoin surged from around $15 to $260 in April, corrected, then surged again from around $100 in October to over $1,000 by December.

3. 2017 Bull Run:

Duration: Around 12 months.

Timeframe: January 2017 to December 2017.

Highlights: Bitcoin skyrocketed from about $1,000 in January to nearly $20,000 in December, driven by ICO mania and mainstream media attention.

4. 2020–2021 Bull Run:

Duration: Roughly 18 months.

Timeframe: Mid-2020 to November 2021.

Highlights: Starting from around $10,000 in mid-2020, Bitcoin reached nearly $69,000 by November 2021, fueled by institutional interest, mainstream adoption, and economic stimulus.

After each bull run, the crypto market generally enters a correction or "crypto winter," where prices stabilize or decline over a prolonged period. These cycles reflect the market's high volatility and the influence of broader economic and market factors.