Example 1) The Dow has declined 49% from the top and now has rallied 46%.

Example 2) The Dow has declined 54% from the top and now has rallied 45%.

Not exactly the same percentages and the time frames are a little different.

It only took about 3 months to decline and the rally took about 4 months.

It took 18 months to decline although 45% of the 54% took place in about 6 months and the rally took about 5 months. So, obviously, the market moved more slowly in example 2.

Example 1 1929-1930
Example 2 2008-2009