How long do bitcoin bear markets last?
About one year, usually.
Bitcoin's shortest bear market period indexed on this site lasted 88 days, and the longest lasted 411 days. Analysis of data from the three most recent bearish market periods shows that, on average, the market has bottomed roughly one year after the price peaked. In 2013, the bear market lasted 410 days. In 2017, the bear market lasted 363 days. In 2021, the bear market lasted 376 days.
Bitcoin's three most recent bear markets lasted 384 days on average, or is a little more than one year. Bitcoin is currently 000 days into its current bear market.