I often listen at 2x speed, not to increase the speed of comprehension, but because the information density is too low. Like forwarding through ads to get to content. Then when you get to the interesting part you slow down and repeat a few times (especially fix-it mechanical assembly youtubes) sometimes at fractional speed... it takes concentration.

Then you use it (or you'll forget it all anyway).

Alternately, I have a friend who listens to novels at 2x, which I don't understand...versus my partner who reads 100 books a year and she's frustrated she can't find new ones fast enough.