Fox count time you save.

You speed up video. Fox do math. Fox tell you when done, how much time back. Free. No account. No fee.

speedfox — try it
1.5× speed
Done at —
Left —
You save —
Get Fox — Free

Drag speed. Numbers move. Real math, 52-min video. This what fox do on real video too.

1
Click button.Zip file land in your Downloads.
2
Open zip.Double-click it. Folder pop out.
3
Type in Chrome:chrome://extensions
4
Developer mode.Turn on the switch in the top-right corner.
5
Load unpacked.Pick the extracted folder. Fox alive.

No Chrome Store needed. Chrome just want you to flip one switch first — that's how it treat any extension that not from Store.