Yes, that is correct. So, when the NASDAQ hit its bottom in September 2002 it then took the NASDAQ
fifteen years (until November 2017) to recover to its previous (February 2000) all-time high.
https://www.macrotrends.net/1320/nasdaq-historical-chart
In other words, now that Bitcoin is correlated to the stock markets, you now need to know the history of the stock markets to know the potential recovery time of the price of Bitcoin if a sustained bear market occurs.
I doubt that most Bitcoin holders are patient enough to wait a few years, much less fifteen years -- especially if they purchased near the market top.
Stocks are backed by real assets, i.e., real running businesses, so long-term investors are patient. Bitcoin is only backed by mere faith and, for most people, faith is easily lost over a long time period.