The speed of the decline is the same as the speed of the gain, it's an about order of magnitude, times three. It looks different in the graph but the graph is misleading.

If you're talking about relative gains/losses you should use a logarithmic base.

Cuz if you wanna work back up from 0.03 to 1 it will take you a year as well at that rate.
And if you wanna crash from down 37 to 1 that will also take you a year.