How frequent are bitcoin bear markets?
Once every 3 years, approximately.
Earlier bearish market periods (i.e., in 2011 and 2013) had much shorter durations that the bear markets that followed in the 2010s and 2020s. But the more recent bear markets for bitcoin occurred every 1,060 days, on average, which is approximately once every three years.
From the end of the 2015 bear market to the start of the 2017 bear market: 1,067 days. From the end of the 2018 bear market to the start of the 2021 bear market: 1,060 days. And from the end of the 2022 bear market to the start of the 2025 bear market: 1,050 days.