⏳ Binge-time calculator
How long to watch Gate Keepers 21?
- non-stop
- 3 h
- non-stop
- episodes
- 6
- episodes
- at 2 h a day
- 2 days
- at 2 h a day
At your pace
One episode a day
6 days
1 hour a day
3 days
2 hours a day
2 days
4 hours a day
1 day
Weekends only, 5 h a day
1 weekend
Faster ways through it
Skip openings & endings
2h 42m
saves 18m
About 3 minutes saved per episode.
Watch at 1.5× speed
2h
saves 1h
Most players support it; dialogue stays clear.
Binge planner
6 episodes × 30 min = 3h
How long to finish Gate Keepers 21? Set how much you watch per day.
2
days to finish
4
episodes per day
1
weekends if you double up
The whole franchise
Every main entry and movie in story order, recaps left out.
13h
7 days at 2 h a day
- 1Gate KeepersTV Series10h
- 2Gate Keepers 21OVA3h
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
- Gate Keepers 213h
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 |
| Gate Keepers 21 | 3h |
Gate Keepers 21 overview · Parents' guide · Longest and shortest anime
Frequently asked questions
How long does it take to watch Gate Keepers 21?
Gate Keepers 21 takes about 3h to watch: 6 episodes of 30 minutes. That's 3 hours non-stop, or 2 days at two hours a day.
How many episodes of Gate Keepers 21 are there?
Gate Keepers 21 has 6 episodes of about 30 minutes each.
How long does it take to watch all of Gate Keepers 21?
The core story plus movies across the franchise runs about 13h over 2 main entries. The watch order page lists them in sequence.
Can I finish Gate Keepers 21 in a weekend?
Yes. At ten hours across Saturday and Sunday you'd finish Gate Keepers 21 in 1 weekend.