Well, if anyone's interested, in my spreadsheet where I track my investment progress, I've kept track of notable dips in the market...at least ones that caught my interest. My spreadsheet starts at 12/31/1997, but I didn't keep a lot of data points from back then.
3/23/2000-4/13/2000: -10.6%
11/2/2000-3/16/2001: -21.6%
5/21/2001-9/21/2001: -28.4%
3/6/2002-7/22/2002: -24.3%
6/30/2004-8/9/2004: -9.3%
5/9/2006-6/14/2006: -11.0%
2/20/2007-3/5/2007: -6.7%
7/19/2007-8/16/2007: -9.7%
10/31/2007-11/21/2007-8.4%
12/31/2007-1/22/2008: -11.8%
2/27/2008-3/17/2008: -8.0%
5/16/2008-11/20/2008: -49.4%
1/6/2009-3/9/2009: -19.6%
1/11/2010-2/12/2010: -5.5%
4/23/2010-7/2/2010: -14.6%
2/17/2010-3/16/2011: -6.2%
7/7/2011-8/8/2011: -14.2%
Note: I had been pretty much charting peaks and valleys with my earlier numbers. But starting in September of 2011, I simply kept the values on the last day of the month, which smooths out the gains and losses somewhat.
5/31/2013-6/28/2013: -3.6%
5/29/2015-9/30/2015: -7.5%
11/30/2015-1/29/2016: -6.0%
9/28/2018-12/31/2018: -13.0%
4/30/2019-5/31/2019: -4.1%
1/31/2020-3/31/2020: -21.6%
8/31/2020-10/30/2020: -4.9%
Now, there have probably been a lot of dips I've missed, where there might be a quick dip but then it bounces back in a few days.
Starting in 2020, around the time COVID hit, I began a second tab in the spreadsheet, and started saving the data from a lot more dates, if I found that particular day interesting, for whatever reason. It's a lot more data to go through, and probably more than most people would be interested in, but giving it a quick glance, it looks like about the only items of note for 2021 so far are:
2/12 - 3/8: -4.2% (recovered by 4/5)
4/29 - 5/13: -4.3% (recovered by 6/24)
I didn't bother to enter any data for 9/16 or 9/17, but as of 9/15, I was only down about 1.5% from a new peak I had hit on 9/3. I know the two days after that were not kind to the market, but I don't think they were substantial enough to sink me that much further.
Anyway, I'm sure these 5% or more dips come along pretty often, probably more than my data suggests. Just be patient...they're like buses. Miss one, and another will come along soon enough (barring budget cuts, of course)