Four weeks in
Two new hires: same start date, same degree, same desk. One went through standard onboarding - induction, modules, a fortnight of shadowing. The other ran the same role as a simulation first, several cycles at rising difficulty, before going live.
It's the fourth week. A live task lands that neither has handled before. The first hire knows the theory and has seen it explained. But this is the first time the decision is genuinely theirs, so they pause, ask, check, and wait for a manager to confirm. The work moves at the manager's pace, not the hire's.
The second hire has been here before. Not this exact task, but this kind of challenge, this kind of incomplete information, this kind of task. They've already been wrong in a setting where being wrong cost nothing, and they've corrected. So they move. A manager reviews the output instead of producing it.
That's the gap a number like "twice as fast" is pointing at. It isn't a quicker reader. It's someone who has already done the work.