Study & writing
Playback speed calculator
Enter the length of the recording and the playback speed to see the new listening time and how much time you get back.
Leave the weekly hours at 0 if you only want to time a single recording.
How playback speed changes duration
Listening time at a faster speed is the original length divided by the speed factor. The time saved is the original length minus that result, and the share saved is 1 − 1 ÷ speed. A 10 h 30 min audiobook at 1.5× takes 630 ÷ 1.5 = 420 minutes, which is 7 hours, saving 3 h 30 min, or one third of the time.
If you also enter how many hours you listen each week, the same rule is applied to the weekly total: 5 hours of podcasts at 1.5× take 3 h 20 min, giving back 1 h 40 min a week and roughly 87 hours a year (52 weeks).
| Speed | A 60-minute recording takes | Time saved | Share saved |
|---|---|---|---|
| 1.25× | 48 min | 12 min | 20% |
| 1.5× | 40 min | 20 min | 33% |
| 1.75× | 34 min 17 s | 25 min 43 s | 43% |
| 2× | 30 min | 30 min | 50% |
| 2.5× | 24 min | 36 min | 60% |
| 3× | 20 min | 40 min | 67% |
Picking a speed you can actually follow
Each step up saves less than the one before. Going from 1× to 1.5× removes 20 minutes from every hour, but going from 2× to 3× removes only another 10. Comprehension, on the other hand, tends to fall faster at the top end, so the sweet spot for most people is somewhere between 1.25× and 2×.
The right speed depends on the material. A chatty interview podcast with pauses and repetition can usually run at 2× without losing much. A lecture with formulas, a dense nonfiction audiobook or anything in a language you are still learning is better at 1.25× or 1.5×, where you can still take notes. Speakers who already talk fast, or recordings with poor audio, also call for a lower setting.
Raise the speed gradually: a week at 1.25× makes 1.5× feel normal, and the brain adapts surprisingly quickly. If you find yourself rewinding often, the time you saved disappears, so drop back a step. For studying, the time freed up is best spent on a short review of what you heard rather than on squeezing in more content.
Frequently asked questions
How long is a 10-hour audiobook at 1.5x speed?
6 hours 40 minutes. Divide the length by the speed: 600 minutes ÷ 1.5 = 400 minutes, which saves 3 hours 20 minutes.
How much time does 2x speed save?
Exactly half. A 1-hour video takes 30 minutes at 2×, and a 9-hour course takes 4 hours 30 minutes.
Is listening at 2x speed bad for understanding?
For easy, conversational content many people follow 2× well after some practice. For dense or unfamiliar material, understanding usually holds up better at 1.25× to 1.5×, so match the speed to how hard the content is.