Top 100 Portal Videos With The Longest Duration by Random Productions
| Video Title | Duration | Category | Game | |
|---|---|---|---|---|
| 1. | Professional Test Subject Part 5 | 21:53 | Portal | |
| 2. | Professional Test Subject Part 4 | 19:42 | Portal | |
| 3. | Professional Test Subject Part 1 | 15:20 | Portal | |
| 4. | Professional Test Subject Part 6 | 12:01 | Portal | |
| 5. | Professional Test Subject Part 3 | 9:41 | Portal | |
| 6. | Professional Test Subject Part 2 | 6:59 | Portal |