This extension was inspired by the science of accelerated playback, read about it here: https://github.com/igrigorik/videospeed/blob/master/README.md
Features:
-Enables the video duration timestamp to scale with video speed.
-The current time will tick once per second regardless of video speed.
-Tracks overall time saved when using faster video speeds.
-Tracks overall time spent watching youtube videos.
Download at: https://chrome.google.com/webstore/detail/youtube-time-tools/cobnfdhokdhiglbojmoapeccpbhonhgi
It is HIGHLY recommended that you use this extension with Video Speed Controlle, available at: https://chrome.google.com/webstore/detail/video-speed-controller/nffaoalbilbmmfgbnbgppjihopabppdk