My personal experience... The first 1-2 days are a rounding error. But it's very common for all internal tooling to be undocumented and fragile. This is a cost

My personal experience... The first 1-2 days are a rounding error. But it's very common for all internal tooling to be undocumented and fragile. This is a cost a team will pay every day in developer efficiency. This is a people and team problem. A sign of a team that cares about this is when the time to first deploy for an engineer is fast and safe.