Time Zones and Engineering Velocity: Real Data
A distributed team with 5 hours of timezone spread has a median lead time of 6.8 days per change. A colocated team in the same codebase — same language, same size, same PR size — has a median lead time of 3.2 days. That's not a rounding error. That's the timezone tax, and it roughly doubles at every additional 3-4 hours of spread. GitLab's 2023 remote-work report estimated "3-5 hours of overlap" as the sweet spot for async-friendly teams, and our IDE-heartbeat data across 100+ B2B companies says the same — but with the extra detail of where exactly the time goes.
This isn't an article about whether remote work is good (it is, for many teams). It's about the specific ways that timezone spread slows delivery, and what measurements tell you whether your distributed team is paying a 2× lead-time penalty or learning to live with it.
