1,782 days Longest other recovery

That would be really tough to trade through.

That's why most people would not be able to run this strategy.

Here's what I get for the longest bad periods.
10/2/2000 to 11/3/2003 THREE years
Values:
10/2/2000 - $1925 Out on 11/1/2000 at $1731
In on 7/1/2003 at $1731
Timing took you out for 31 months.
That's a long time sitting in a 3% MM fund when your backtest says you should be getting 20+%.


Untimed:
11/1/2000 - $2652
7/1/2003 - $1181

Next date above $2652 was 2/1/2011 at $2634.
An entire decade!
BTW, timed on 2/1/2011 - $5481

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Next one , 2/1/2008
Timed, $3048 to get back in on 9/1/2009 at $3048.
Almost 1.5 years. Timing took you out for 19 months.


Untimed
2/1/2008 - $2080 The high was on 6/2/2008 at $2289
9/1/2009 - $1465
Next date above $2289 was 11/1/2010 at $2396

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Next one, timing took you out 5/2/2022 to 4/3/2023
Untimed, the high was 11/1/2021 and the next date above that was 7/1/2024.
33 month recovery time.

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Most people would not be able to run this strategy.