Beginner
≈ 30 minSuggested range18 min – 48 min
Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗
Ninjago · SET 30425
CRU Masters' Training Grounds
A small training area with three characters.
- Pieces
- 43
- Release year
- 2017
- Theme
- Ninjago
- Set number
- 30425
- LEGO recommended age
- 6+
- Historical price in EUR
- Not verified
The historical euro price has not been verified. No current offer or conversion from another market is shown.
Official English name verified at: LEGO English archive ↗ · Checked on 26 October 2026.
TIME TO BUILD
How long does it take to build CRU Masters' Training Grounds?
A starting point for planning your build. Times for each experience level are editorial estimates, not measurements submitted by HowLongToBuild users.
Editorial estimate · first build
Intermediate
≈ 20 minSuggested range12 min – 32 minExperienced
≈ 14 minSuggested range8 min – 23 minBased on one person building the set for the first time, following the original instructions and using numbered bags where supplied. Includes normal piece-finding and minor adjustments; excludes long breaks, filming, dismantling and modifications. Sources may use different methods. This range is neither a statistical interval nor a limit: your build may take less or more time.
How we estimate times · sources and method
Editorial assessment: A small training area with three characters. Two figures carry long grey and brown weapons. A first build following the instructions, including normal piece finding; an adult may help when needed. Breaks, subsequent play and any alternative models are excluded. For older sets, unnumbered bags or previously mixed pieces may prolong sorting. No verified timed build: indicative values with substantial variation.
Sources do not always specify the builder’s experience. The three experience bands are our editorial assessment, based on the complexity of the set and individual accounts where available.
- LEGO · set-specific instructions ↗
Official name, pieces, age and imagery; no timed building data.
- LEGO · set manual ↗
Document for this set number. The duration is an editorial estimate, not a LEGO timing.
Checked: 26 October 2026 · Method v1.0 · Limited reports; not a statistical average.
BUILT BY THE COMMUNITY
Yours could be the first building time.
0 reviewed solo building times.
No solo building times have been reviewed yet. You can still find editorial estimates under Suggested times.
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Did you know?
Inside the set
The illustrated model
A beige platform accompanies the master with a golden hat.
LEGO sourceA detail of the scene
Two figures carry long grey and brown weapons.
LEGO sourceBeyond the set
The stories, places and inventions behind your build.
A capital founded in 794
Kyoto was laid out using ancient Chinese capitals as a model and remained Japan’s imperial capital until the mid-nineteenth century. Its buildings reflect more than a millennium of architectural culture.
UNESCOHeritage across several cities
The UNESCO site includes seventeen components in Kyoto, Uji and Otsu. Nijō Castle joins religious complexes, showing how places with different functions tell the story of a historic city.
UNESCOWritten by HowLongToBuild · Sources are linked with each story · Checked on 26 October 2026. Historical facts and story details refer to the context described.
THE COMMUNITY’S EXPERIENCE
What was it like to build?
Three separate scores from 1 to 10. For difficulty, 1 means very easy and 10 means very difficult.
No approved ratings yet. Scores are never generated by this site or inferred from the recommended age.
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Specific steps, useful checks and sticking points. Contributions appear after moderation, in their original language. Do not upload instruction pages or personal contact details.
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Sign in to contributeSET THE MOOD
A soundtrack for your build
CRU Masters' Training Grounds · Selected for the subject and atmosphere
Electronic pulses and orchestral colours accompany structures, wheels and mechanical assemblies. The rhythm suggests movement.
OUR PICK
TRON: Legacy
Daft Punk
Electronic and orchestral · pulsingTry a different atmosphere
ANOTHER MOOD
Ambient 1: Music for Airports
Brian Eno
Ambient · minimal and relaxedEditorial suggestions, not official soundtracks for the set. External services may require an account or subscription; editions and availability can vary by country. Suggest another soundtrack →
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YOUR NEXT BUILD
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Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗
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Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗
Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗
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