Beginner
≈ 2 h 45 minSuggested range1 h 30 min – 4 h 45 min
Official LEGO® image · © LEGO Group and/or the respective rights holders. Source: LEGO Italy ↗
City · SET 7900
Heavy Loader
A truck for transporting heavy loads.
- Pieces
- 347
- Release year
- 2006
- Theme
- City
- Set number
- 7900
- LEGO recommended age
- 5+
- Archived regional retail price · US
- 24.99 USD
Archived regional retail price in the stated market and currency. It does not establish the Italian launch price; no estimated currency conversion. Brickset ↗ · Reference checked on 28 October 2026
Official English name verified at: LEGO English archive ↗ · Checked on 26 October 2026.
TIME TO BUILD
How long does it take to build Heavy Loader?
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
≈ 2 hSuggested range1 h – 3 h 15 minExperienced
≈ 1 h 15 minSuggested range45 min – 2 h 15 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 truck for transporting heavy loads. A large grey lattice structure occupies the load. 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 model in the photo
The yellow cab pulls a long flatbed.
LEGO sourceAccessories and details
A large grey lattice structure occupies the load.
LEGO sourceBeyond the set
The stories, places and inventions behind your build.
A 1956 experiment
On 26 April 1956 the Ideal X was used to test standardised containers at Port Newark.
Read the full story
Ideal X sailed from Port Newark’s Berth 24 to Houston carrying 58 containers. The Port Authority records one container loaded every seven minutes and loading completed in under eight hours. Gateway City carried over three times as many the next year.
From ship to truck
The system used loads stacked aboard ship and transferable to compatible truck chassis, linking the two modes of transport.
Read the full story
The Port Authority notes that McLean did not invent metal cargo boxes. His breakthrough concerned handling freight, reducing repeated movement of individual packages. Containerisation reshaped ships, trucks, rail cars and cranes together: the vessel was only one part of a connected transport system.
Expanded stories updated on 29 October 2026
Written 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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Sign in to contributeSET THE MOOD
A soundtrack for your build
· Selected for the subject and atmosphere
The Secret Life of Pets offers a comic character for small figures and everyday scenes. The affinity is lively domestic storytelling, not nature in general.
OUR PICK
The Secret Life of Pets (Original Motion Picture Soundtrack)
Alexandre Desplat
Rhythmic and livelyEditorial 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 ↗