⏳ Binge-time calculator
How long to watch Fastening Days 4?
- non-stop
- 1 h
- non-stop
- episodes
- 3
- episodes
- at 2 h a day
- 1 day
- at 2 h a day
At your pace
One episode a day
3 days
1 hour a day
1 day
2 hours a day
1 day
4 hours a day
1 day
Weekends only, 5 h a day
1 weekend
Faster ways through it
Watch at 1.5× speed
12m
saves 6m
Most players support it; dialogue stays clear.
Binge planner
3 episodes × 6 min = 18m
How long to finish Fastening Days 4? Set how much you watch per day.
1
day to finish
20
episodes per day
1
weekends if you double up
The whole franchise
Every main entry and movie in story order, recaps left out.
52m
1 day at 2 h a day
- 1Fastening DaysONA15m
- 2Fastening Days 2ONA10m
- 3Fastening Days 3ONA9m
- 4Fastening Days 4ONA18m
How it compares
Shorter than the 20 most popular series
- Ansatsu Kyoushitsu 2nd Season9h 35m
- Ansatsu Kyoushitsu8h 26m
- Boku no Hero Academia5h 12m
- One Punch Man4h 48m
- Attack on Titan Season 24h 48m
- Attack on Titan Season 34h 47m
- No Game No Life4h 36m
- Attack on Titan Season 3 Part 23h 59m
- Fastening Days 418m
Show as table
| Item | Runtime |
|---|---|
| Ansatsu Kyoushitsu 2nd Season | 9h 35m |
| Ansatsu Kyoushitsu | 8h 26m |
| Boku no Hero Academia | 5h 12m |
| One Punch Man | 4h 48m |
| Attack on Titan Season 2 | 4h 48m |
| Attack on Titan Season 3 | 4h 47m |
| No Game No Life | 4h 36m |
| Attack on Titan Season 3 Part 2 | 3h 59m |
| Fastening Days 4 | 18m |
Fastening Days 4 overview · Parents' guide · Longest and shortest anime
Frequently asked questions
How long does it take to watch Fastening Days 4?
Fastening Days 4 takes about 18m to watch: 3 episodes of 6 minutes. That's 1 hour non-stop, or 1 day at two hours a day.
How long does it take to watch all of Fastening Days 4?
The core story plus movies across the franchise runs about 52m over 4 main entries. The watch order page lists them in sequence.
Can I finish Fastening Days 4 in a weekend?
Yes. At ten hours across Saturday and Sunday you'd finish Fastening Days 4 in 1 weekend.