The largest LEGO Star Wars sets take 20 to 32 hours to build, and the mid-size Ultimate Collector Series models take 5 to 19 hours. The 9,031 piece UCS Death Star (75419) is the longest at an estimated 24 to 32 hours, followed by the Millennium Falcon at 20 to 27 hours.
Star Wars is where LEGO puts its biggest builds, so it is also where the question of time matters most. Here is the whole range.
The Ultimate Collector Series, ranked by build time
| Set | Pieces | Estimated build time |
|---|---|---|
| Death Star (75419) | 9,031 | 24 to 32 hours |
| Millennium Falcon (75192) | 7,541 | 20 to 27 hours |
| AT-AT (75313) | 6,785 | 18 to 24 hours |
| The Razor Crest (75331) | 6,187 | 16 to 22 hours |
| Venator-Class Republic Attack Cruiser (75367) | 5,381 | 14 to 19 hours |
| Imperial Star Destroyer (75252) | 4,784 | 13 to 17 hours |
| Death Star (75159) | 4,024 | 11 to 14 hours |
| TIE Interceptor (75382) | 1,931 | 5.5 to 7.5 hours |
| The Mandalorian's N-1 Starfighter (75442) | 1,809 | 5 to 7 hours |
| Boba Fett (75455) | 1,544 | 4.5 to 6 hours |
Estimates for an average adult builder, based on piece count and complexity.
Two Death Stars, two very different evenings
If you search for the LEGO Death Star build time you will find two answers, and both are right. The 2016 model (75159) is 4,024 pieces and an estimated 11 to 14 hours. The 2025 model (75419) is 9,031 pieces and an estimated 24 to 32 hours, more than twice the commitment.
Always check the set number before you plan around a build time. This is the single most common mix-up in the Star Wars range, and the same applies to the two Millennium Falcons: the 2017 UCS model (75192) at 7,541 pieces and the 2007 original (10179) at 5,198 pieces.
What the records tell you
The Guinness World Record for the fastest build of the Millennium Falcon (75192) is 7 hours 27 minutes 9 seconds, set by Lukas Herrscher of Germany on 11 July 2026.
Against our estimate of 20 to 27 hours, that is roughly three times faster. Not because record holders place bricks three times quicker, but because a record attempt removes everything that is not assembly: searching for pieces, re-reading steps, and stopping. More on that in the fastest LEGO builders in the world.
Why big Star Wars ships build faster than they look
A 6,785 piece AT-AT does not take seven times as long as a 1,000 piece set. It takes about six times as long.
Large display models rely on repetition and symmetry, and Star Wars ships are the clearest example: two identical wings, four nearly identical legs, long repeated hull sections. Once you have built one, the next goes in faster. Our model accounts for this by raising the pace from about 300 pieces per hour on a standard set to about 330 above 3,000 pieces.
The flip side is that the repetition is where builders stall. The middle third of a big ship is the part people put down and do not pick up for a week.
Planning a UCS build
A 20 hour set is seven evenings, or two long weekend days plus a bit. Three things make that go smoothly:
- Use the bags as your schedule. A UCS set has dozens of numbered bags, and each one is a clean stopping point. Stopping mid-sub-assembly is what makes returning feel like work.
- Sort before each session, not once at the start. Sorting the whole set at once is a chore; sorting one bag takes two minutes and pays for itself.
- Expect the middle to drag. It is not you, it is the hull.
If you want the specific number for the set in front of you, look it up on our build-time pages. If you are choosing between sizes, the piece count table covers everything from 200 to 10,000 pieces, and how long large sets take covers the biggest builds across all themes.