There’s also a great deal outside your control for making accurate estimates that is never accounted for: coworkers who don’t review your PRs, flakey build syst

There’s also a great deal outside your control for making accurate estimates that is never accounted for: coworkers who don’t review your PRs, flakey build systems, slow build systems, coworkers who do review your PRs but build an enormous punch list of things that may or may not be in scope for the work, complex merge conflict resolution that requires understanding concurrent work, linters that fail your PR, etc.