Witcher 3 - About Speedruns and Completion

Gamepur informs us about what a 25 hour speedrun in The Witcher 3 actually means and what it takes to reach 100% completion.

We've said recently that a rushed playthrough of The Witcher 3 takes our testers around 25 hours. However we didn't explain what it actually means. This information sparked debates on various discussion forums. People were confused. How could a 200-hour game be beaten in only 25 hours?", said an executive from the development team.

A speed playthrough is skipping everything that's skippable. You just rush through the game content to test whether the main questline has bugs that prevent it from being completed.
Speedrunning the main questline of The Witcher 3 takes 25 hours.

They also mention it will take the average gamer 2 months to complete the game.