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About this tool
See how playback speed changes your lecture backlog finish date, with a full 1x-2x comparison table.
This planner computes the exact date you finish a video lecture backlog at each playback speed, using the model that watching at speed s for W minutes consumes W x s minutes of content, minus a pause-and-notes overhead you set. It is for coaching students and self-paced learners staring at a 100-hour backlog who want a concrete answer to 'does 1.5x actually get me done before the mock test?' — with a side-by-side table for 1x through 2x.
Open Video Lecture Speed Planner on AltFTool — it loads instantly in your browser.
Upload or drag in the file you want to work with.
Adjust the settings and preview the result.
Download the finished file to your device.
Turns 'about a month' into an exact calendar date for every speed from 1x to 2x.
Accounts for the pause, rewind and note-taking time that plain duration maths ignores.
Shows precisely how many days each speed step buys, so the trade-off is explicit.
Exactly half the playback time: a 100-hour backlog needs 50 hours of watching at 2x. Whether that halves your calendar days depends on your daily sitting time and pause overhead, which is what this planner computes — enter your numbers and read the days-saved column.
Research on speeded lecture viewing, including a 2022 UCLA study in Applied Cognitive Psychology, found comprehension holds up well at up to about 2x for typical lecture material, though it degrades beyond that. Dense derivations, proofs and brand-new topics are the exception — most learners should take those at 1x.
Time one real session: if a 60-minute sitting clears only 48 minutes of video, your overhead is 20%. Note-heavy subjects commonly run 10-30%; passive revision watching is close to 0%.
Because if the whole remaining backlog fits inside your first day's watch time, you finish on the start date itself, not the day after. The planner divides content by daily cleared content, rounds up to whole days, and adds days-minus-one to the start date.