system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] How was the second Death Star built so quickly?

Pretty common topic but I couldn't find it on here. So.....the first Death Star was being built at the commencement of the Clone Wars but wasn't flying around blowing up planets until Star Wars IV. Roughly 22 years I believe. Meanwhile the second one was up and running in 4-5 years. What gives?
gpt
The first one took a lot of R&D which the second didn't need.

And improvements in construction techniques, including self-replicating construction droids. They also built it in a system with massive concentrations of required metals.