Getting started
Enter one duration per line, such as 25:30 or 1:20:00. Two parts mean minutes:seconds, so 90:00 is valid. With three parts, minutes and seconds must be 00–59. Video titles and playlist links are not supported.
For several lectures, put each length on its own line and enter the speed you intend to use in the player. A speed of 1 is normal; larger is faster and smaller is slower. One speed applies to every entered duration.
Compare original and adjusted totals to plan your schedule. One hour plus thirty minutes takes one hour at 1.5×. Copy the count and times into your study plan or notes.
Rules and limits
Watch time = total duration ÷ speed. Only the combined result is rounded up to whole seconds; time saved or added is the difference between the displayed totals. Ads, pauses, notes, review and buffering are excluded, so real elapsed time may be longer. This tool neither controls a player nor checks its supported speeds.