How Long Does LEGO® Heavy-Duty Excavator (42121) Take to Build?

A typical builder finishes LEGO® Heavy-Duty Excavator (set 42121, 569 pieces) in about 1 hour 50 minutes. Taking it slowly runs closer to 2 hours 30 minutes; building at a fast pace, about 1 hour 25 minutes.

PieceTick estimates build time from piece count, part complexity, the set’s age rating, your experience level, and how you sort pieces. Adjust those on this page for an estimate matched to how you build.