https://chromewebstore.google.com/detail/simple-youtube-watch-time/emfmcknpkcbphpgibagnamhkmkkidjhd?hl=en
Simple YouTube Watch Time Tracker - Chrome Web Store
Tracks the time you sepnd watching YouTube videos and displays Yearly, Monthly and overall stats in a simple popup.
youtube watch timesimpletrackerchromeweb
https://www.proxy-youtube.com/
YouTube Proxy - Watch YouTube Videos Any Time Anywhere
Proxy-Youtube.com is a free web proxy designed for YouTube. It enables you to watch all YouTube videos without any restrictions even in company or school.
youtube proxywatch videosany timeanywhere