If you are constantly turning the wheel and applying pedals in a way such that autopilot wasn't engaged, how does autopilot do anything? Alternatively, if you

If you are constantly turning the wheel and applying pedals in a way such that autopilot wasn't engaged, how does autopilot do anything? Alternatively, if you aren't constantly turning the wheel and applying pedals, how many seconds do you think it takes you to start? And before that, how much slower is your base reaction time when your "attention is on the road" but you're not driving?