The same number of days has passed from the top of the 2017 bull run to the bottom of the Covid-2020 crash as compared to from the top of the 2021 bull run till today. Though if you consider the top is on November 2021, we still have about a few months away.
Why is this significant? Idk, if you're a believer of the 4 year cycles, then we may already be at the start of the next bull run