Playback Speed Calculator by 5pyd3r

Enter a length in hours, minutes, and seconds, set a playback speed with
the slider or a preset (1x, 1.25x, 1.5x, 1.75x, 2x), and see the
real-world watch time instantly - plus how much time you save (or add)
at that speed.

Formula: total time = (hours3600 + minutes60 + seconds) / speed

Features:
- Live calculation as you type or drag the slider
- Speed presets for common values
- Remembers your last length and speed while the browser is open
- No accounts, no network requests, no data collection