CS fundamentals & GATE · English
How long is Harvard CS50x (2025 lectures)?
Harvard CS50x (2025 lectures) by CS50 (Harvard) is 26h 22m long across 13 videos. Checked against YouTube on November 3, 2026.
- Total length
- 26h 22m
- At 1.5x
- 17h 34m
- At 2x
- 13h 11m
- Videos
- 13
Track your progress through this course
Enter the video you're on to see what's left at your speed. It remembers your place next time.
About this course
The 2025 CS50x lectures from Harvard: Scratch, C, arrays, algorithms, memory, data structures, Python, SQL and HTML, CSS and JavaScript, closing with “The End”. Only thirteen videos, but most lectures run over two hours, so this is a much bigger watch than it looks.
- Average video: 2h 1m
- Longest video: 3h 14m — CS50x 2025 - Lecture 8 - HTML, CSS, JavaScript
- Shortest video: 1m 44s — CS50x 2025 - Introduction
Harvard CS50x (2025 lectures) at faster speeds
| Speed | Watch time | Time saved |
|---|---|---|
| 1x | 26h 22m | — |
| 1.25x | 21h 5m | 5h 16m |
| 1.5x | 17h 34m | 8h 47m |
| 1.75x | 15h 4m | 11h 18m |
| 2x | 13h 11m | 13h 11m |
How many days to finish it
Days needed at a fixed daily budget, never splitting a video across two days.
| Daily time | At 1x | At 1.5x | At 2x |
|---|---|---|---|
| 30 min a day | 13 days | 13 days | 13 days |
| 1 hour a day | 13 days | 13 days | 13 days |
| 2 hours a day | 13 days | 12 days | 11 days |
Questions
- How long is Harvard CS50x (2025 lectures)?
- Harvard CS50x (2025 lectures) is 26h 22m long across 13 videos (checked November 3, 2026). That is 17h 34m at 1.5x speed or 13h 11m at 2x.
- How many days does it take to finish Harvard CS50x (2025 lectures)?
- At 1 hour a day at normal speed it takes about 13 days, or 13 days at 1.5x. At 2 hours a day at 1.5x it takes about 12 days. Days are counted without splitting any video across two days.
- Can I keep track of how much of Harvard CS50x (2025 lectures) I have left?
- Yes. Open the playlist in the calculator, choose “What’s left” and enter the video you are on. It shows the time remaining at your speed and remembers your place in this browser, so you can pick up where you left off next time.