How to Use the Lecture Playback Speed Calculator
If you're unsure what playback speed to pick for an online course, it helps to see exactly how much time you'd actually save. This calculator takes your total lecture length and playback speed and calculates the actual time needed and how much you save.
For example, a 10-hour course watched at 1.5x finishes in about 6 hours 40 minutes, saving 3 hours 20 minutes. Higher speeds save more time but can hurt comprehension, so use a lower speed for difficult new material and a higher one for review or familiar content.
Rather than letting the saved time slip away, reinvest it into review or hands-on practice — that offsets any comprehension lost to speeding up while still boosting your overall learning efficiency.
Frequently Asked Questions
It saves time, but comprehension can drop. Use 1-1.25x for difficult new material, and 1.5-2x for review or content you're already familiar with.
Reinvesting the saved time into review or practice helps offset any comprehension lost from speeding up. That's usually a better use than just cramming in more lectures.